Calculus Archive: Questions from March 15, 2023
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Find each limit. \[ f(x, y)=\sqrt{y}(y+8) \] (a) \( \lim _{\Delta x \rightarrow 0} \frac{f(x+\Delta x, y)-f(x, y)}{\Delta x} \) (b) \( \quad \lim _{\Delta y \rightarrow 0} \frac{f(x, y+\Delta y)-f(x,2 answers -
\( \begin{array}{l}\frac{x^{3}}{\sqrt{1-x^{2}}} d x \\ \frac{3 x^{2}-5 x+3}{(x-2)\left(x^{2}+1\right)} d x\end{array} \)2 answers -
i. Find the gradient of f. ii. Find the directional derivative. iii. Find the direction of the greatest directional derivative of f in (1,-2). What does it mean?
5. Sea \( f(x, y)=x^{3}+4 x^{2} y-2 y \quad \) y \( \quad u=\langle 1 / 3,2 \sqrt{2} / 3\rangle \). (i) Encontrar el gradiente de \( f \). (ii) Encontrar la derivada direccional \( D_{u} f(x, y) \) en2 answers -
Match the third order linear equations with their fundamental solution sets. 1. \( y^{\prime \prime \prime}-5 y^{\prime \prime}+6 y^{\prime}=0 \) 2. \( y^{\prime \prime \prime}+y^{\prime}=0 \) 3. \( y2 answers -
7. Un sólido rectangular, se encuentra sumergido en un recipiente que contiene agua. Determinar la fuerza total del fluido sobre cada una de las superficies verticales del sólido si el nivel del flu2 answers -
Resolver las siguientes aplicaciones de la integral: (75\%) 4. Considere una capa cilindrica de longitud \( \mathrm{L} \), radio interior \( \mathrm{r}_{1} \) y radio exterior \( r_{2} \), cuya conduc2 answers -
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Differential Equation: Undetermined Coefficients
(1) \( y^{\prime \prime \prime}-y^{\prime \prime}-4 y^{\prime}+4 y=5-e^{x}+e^{-x} \)2 answers -
Solve using Laplace Transform \[ y^{\prime \prime}+2 y^{\prime}-y=t e^{-t}, \quad y(0)=0, y^{\prime}(0)=1 \]2 answers -
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5. Evaluate the integral \( \iint_{R} \sin x \cos y d A \) where \( R=\left\{(x, y) \mid 0 \leq x \leq \frac{\pi}{3}, 0 \leq y \leq \frac{\pi}{4}\right\} \)2 answers -
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1. determine id the vector dield is conservative: 2.Find rot F of F(x,y,z)
1. Determine si el campo vectorial es conservativo: \[ F(x, y)=\frac{1}{\sqrt{x+y}}\left(x^{2} i+y^{2} j\right) \] \( (x, y, z)=\tan ^{-1}\left(\frac{x}{y}\right) i+\ln \sqrt{x^{2}+y^{2}} j+k \)2 answers -
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5. Evaluar la integral de línea \( \int_{c}(x-y) d s \), cuando la curva es \( r(t)=4 t i+3 t j \) cuando \( 0 \leq t \leq 1 \). Evaluating the line integral \( \int(x-y) d s \) c , when the curve i2 answers -
7. Usando el teorema de Green, calcular la integral \[ \int(y-x) d x+(2 x-y) d y \text {, acotadas por las } \] ecuaciones \( y=x \) y \( y=x^{2} \). Using Green's theorem, calculate the integral \(2 answers -
8. Utilizando el teorema fundamental de integrales de línea, evaluar \( F(x, y)=\cos (x) \operatorname{sen}(y) i+\operatorname{sen}(x) \cos (y) j \) donde \( C \) es una línea de \( (0,-\pi) a\left(2 answers -
5. Evaluate the integral \( \iint_{R} \sin x \cos y d A \) where \( R=\left\{(x, y) \mid 0 \leq x \leq \frac{\pi}{3}, 0 \leq y \leq \frac{\pi}{4}\right\} \)2 answers -
evaluate the following integral
12. Evaluar la siguiente integral \[ \begin{array}{l} \int_{c}\left(x^{2}+y^{2}+z^{2}\right) d s \\ c: r(t)=\operatorname{sen}(t) i+\cos (t) j+3 k \\ 0 \leq t \leq \frac{\pi}{4} \end{array} \]0 answers -
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Evaluate the double integral. \[ \iint_{D} 5 y^{2} d A_{,} \quad D=\{(x, y) \mid-1 \leq y \leq 1,-y-2 \leq x \leq y\} \]2 answers -
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\( \int \sin ^{4} x \cos ^{2} x d x \) \( \int \frac{e^{4 x}}{\left(e^{8 x}-81\right)^{3 / 2}} d x \)2 answers -
Is the following a function? Explain. \[ f(x, y)=\left\{\begin{array}{ll} \sqrt{y} & \text { if } y \geq 0 \\ \sqrt{x} & \text { if } x \geq 0 \end{array}\right. \]2 answers -
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Find all the second partial derivatives. \[ \begin{array}{l} \quad f(x, y)=x^{4} y-2 x^{3} y^{2} \\ f_{x x}(x, y)=12 x y(x-y) \\ f_{x y}(x, y)= \\ f_{y x}(x, y)= \\ f_{y y}(x, y)=-4 x^{3} \end{array}2 answers -
Find all the second partial derivatives. \[ f(x, y)=x^{4} y^{5}+6 x^{6} y \] \[ f_{x x}(x, y)= \] \[ f_{x y}(x, y)= \] \[ f_{y x}(x, y)= \] \[ f_{y y}(x, y)= \]2 answers -
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Find \( d y / d x \) by implicit differentiation. \[ \begin{array}{c} e^{y} \cos (x)=1+\sin (x y) \\ y^{\prime}=-\frac{x \cos (x y)-e^{y} \cos (x)}{e^{y} \sin (x)+y \cos (x y)} \end{array} \]2 answers -
Practica: Cierto o Falso / Truth or False
1. La pendiente de la gráfica \( y=x^{2} \) es distinta en cada punto de la curva. 2. Si \( f^{\prime}(x)=g^{\prime}(x) \), entonces \( f(x)=g(x) \). 3. La pendiente de la gráfica \( y=f(x) \) en el2 answers -
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Find \( y^{\prime} \) and \( y^{\prime \prime} \). \[ y=\frac{\ln (5 x)}{x^{7}} \] \[ y^{\prime}= \] \[ y^{\prime \prime}= \]2 answers -
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Encuentre la derivada de cada una de las siguientes funciones.
a) \( y=\sqrt{2} x+\frac{1}{\sqrt{2}} \) b) \( y=\left(\frac{1}{x}+\frac{1}{x^{2}}\right)\left(3 x^{3}+27\right) \) c) Encuentre \( y^{\prime \prime} \) si \( y=\frac{3 x-2}{5 x} \) d) \( f(x)=\sec x-2 answers -
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6. Find the derivative of the function. \[ g(x)=\left(\frac{x+3}{x^{2}+6}\right)^{3} \] a. \( \quad g^{\prime}(x)=\frac{3\left(6-6 x+x^{2}\right)}{\left(6+x^{2}\right)}\left(\frac{3+x}{6+x^{2}}\right)2 answers -
7. Find the derivative of the function \( y=-8 \cos (2 x) \). a. \( \quad y^{\prime}=2 \sin (2 x) \) b. \( \quad y^{\prime}=8 \sin (2 x) \) c. \( \quad y^{\prime}=16 \sin (2 x) \) d. \( \quad y^{\prim2 answers -
8. Find the derivative of the function \( y=7 \sin (2 x) \) a. \( \quad y^{\prime}=14 \sin (2 x) \) b. \( y^{\prime}=14 \cos (2 x) \) c. \( \quad y^{\prime}=-7 \sin (2 x) \) d. \( \quad y^{\prime}=-142 answers -
9. Find the derivative of the function. \[ y=\cos \left(3 x^{4}+4\right) \] a. \( \quad y^{\prime}=12 x^{4} \cos \left(3 x^{4}+4\right) \) b. \( y^{\prime}=12 \sin \left(3 x^{4}+4\right) \) c. \( \qua2 answers -
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11. Find the derivative of the function. \[ y=\frac{6}{7} \sec ^{2} x \] a. \( y^{\prime}=-\frac{12}{7} \sec ^{2} x \tan x \) b. \( y^{\prime}=\frac{12}{7} \sec ^{2} x \tan ^{2} x \) c. \( y^{\prime}=2 answers -
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Evaluate the integral.
3) \( \int_{0}^{1} \int_{0}^{y} e^{x+y} d x d y \) A) \( \frac{1}{e}\left(e^{2}-e\right)^{2} \) B) \( \frac{1}{2}(e-1)^{2} \) C) \( \frac{1}{2}\left(\mathrm{e}^{2}-\mathrm{e}\right)^{2} \) D) \( \frac2 answers -
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Calculate the double integral. \[ \iint_{R}\left(6 y+x y^{-2}\right) d A, \quad R=\{(x, y) \mid 0 \leq x \leq 2,1 \leq y \leq 2\} \]2 answers -
Find the total differential of \( z=f(x, y) \), where \[ f(x, y)=6 \sin \left(3 x^{y}\right) \]2 answers -
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Find the total differential of \( z=f(x, y) \), where \[ f(x, y)=5 \sin \left(3 x^{y}\right) \] \( d z= \)2 answers -
find dy/dx by implicit differentiation (even numbers)
7. \( x^{2}+x y-y^{2}=4 \) 8. \( 2 x^{3}+x^{2} y-x y^{3}=2 \) 9. \( x^{4}(x+y)=y^{2}(3 x-y) \) 10. \( y^{5}+x^{2} y^{3}=1+x^{4} y \) 11. \( y \cos x=x^{2}+y^{2} \) 12. \( \cos (x y)=1+\sin y \) 13. \(2 answers -
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Find all the second partial derivatives. \[ \begin{array}{l} \quad f(x, y)=\sin ^{2}(m x+n y) \\ f_{x x}(x, y)= \\ f_{x y}(x, y)= \\ f_{y x}(x, y)= \\ f_{y y}(x, y)= \end{array} \]2 answers -
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Find dy/dt. 41) \( y=\cos ^{5}(\pi t-8) \) 42) \( y=\cos (\sqrt{6 t+12}) \) 43) \( y=t^{7}\left(t^{5}-6\right)^{3} \)0 answers -
Use logarithmic differentiation to find the derivative of \( y \). 54) \( y=\sqrt{\frac{x}{x+7}} \) 8 55) \( y=x(x-8)(x+5) \) 56) \( y=\left(x^{3}+1\right)^{4}(x-1)^{3} x^{4} \) 57) \( y=\frac{x \sin2 answers -
Find the derivative of \( y \) with respect to \( x \). 72) \( y=-\cot ^{-1} \frac{6 x}{3} \) 73) \( y=\cos ^{-1}\left(3 x^{2}-2\right) \) 74) \( y=\sin ^{-1}\left(\frac{6 x+3}{5}\right) \) 75) \( y=\2 answers -
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Find the derivative of the following: (a) \( y=e^{x}\left(x^{2}+5 x+1\right) \) (b) \( y=\frac{x^{2}-5}{2 x+6} \) (c) \( y=\sqrt{3 x^{5}+6} \)2 answers -
3. Find the Inverse Laplace transform of the following: a. \( \frac{3 \mathrm{~s}+2}{\mathrm{~s}^{2}+25} \) b. \( \frac{5 \mathrm{~s}^{2}+3}{\left(\mathrm{~s}^{2}+4\right)^{2}} \) Hint: \( \left\{\beg2 answers -
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Use the guidelines of this section to sketch the curve. 31. \( y=\sqrt[3]{x^{2}-1} \) 32. \( y=\sqrt[3]{x^{3}+1} \) \( =x^{3}+3 x^{2} \) 2. \( y=2 x^{3}-12 x^{2}+18 x \) 33. \( y=\sin ^{3} x \) 34. \(2 answers -
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1-54 Use the guidelines of this section to sketch the curve. 1. \( y=x^{3}+3 x^{2} \) 2. \( y=2 x^{3}-12 x^{2}+18 x \) 3. \( y=x^{4}-4 x \) 4. \( y=x^{4}-8 x^{2}+8 \) 5. \( y=x(x-4)^{3} \) 6. \( y=x^{2 answers -
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Use the guidelines of this section to sketch the curve. \[ \begin{array}{l} =x^{3}+3 x^{2} \\ =x^{4}-4 x \\ =x(x-4)^{3} \\ =\frac{1}{5} x^{5}-\frac{8}{3} x^{3}+16 x \\ =\frac{2 x+3}{x+2} \\ =\frac{x-x2 answers -
Solve the initial value problem. \[ y^{\prime \prime}-y^{\prime}-12 y=144 x^{3}+12.5, y(0)=11, y^{\prime}(0)=-18.5 \] \[ y(x)= \]2 answers -
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