Calculus Archive: Questions from April 19, 2023
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7. Evaluate \[ y=\lim _{x \rightarrow \frac{1}{2}^{+}} \frac{\sin (4 \pi x)}{\sqrt{x-\frac{1}{2}}} \]2 answers -
7. Evaluate \[ y=\lim _{x \rightarrow \frac{1}{2}^{+}} \frac{\sin (4 \pi x)}{\sqrt{x-\frac{1}{2}}} \]2 answers -
\( (z) \) Find the Jacobian. \( \frac{\partial(x, y, z)}{\partial(s, t, u)} \), where \( x=4 s-5 t+3 u, y=3 u-(5 s+5 t), z=-(4 s+3 t+2 u) \). \[ \frac{\partial(x, y, z)}{\partial(s, t, u)}= \]2 answers -
1. Match the Graph (2). \( (A): y=x^{2}-2,(B): y=2+x^{2},(C): y=\left\{\begin{array}{ll}x^{2}-2 & \text { if } x2 answers -
16. Consider the function \( f(x, y)=x^{3}+5 y^{3}-15 y^{2}-27 x+12 \). (a) Compute \( D(x, y)=f_{x x}(x, y) \cdot f_{y y}(x, y)-\left(f_{x y}(x, y)\right)^{2} \). (b) Write down all the critical poin2 answers -
Solve each of the following ordinary differential equations
13. \( y^{\prime \prime}-y=\frac{e^{2 x}}{e^{x}+e^{-x}} \) 14. \( y^{\prime \prime}-2 y^{\prime}+y=\frac{e^{x}}{1+x^{2}} \)2 answers -
need help
Find \( \frac{d y}{d x} \) given \( \sin x-\cos y-2=0 \) \[ \frac{2-\cos x}{\sin y} \] \( -\csc y \cos x \) \( -\cot y \) \( \frac{\csc y}{\cos x} \)2 answers -
(5) Find all local maxima, local minima, and saddle points for the functions below (a) \( f=2 x y-x^{2}-2 y^{2}+3 x+4 \); (b) \( f=x^{4}+y^{4}+x y \); (c) \( f=\ln (x+y)+x^{2}-y \).2 answers -
Can you explain step by step what happened here.
\( \begin{array}{l}\text { (3) } L=\frac{4}{45} \int_{0}^{64} \sqrt{(x-30)^{2}+\frac{2025}{16}} d x \\ =\frac{4}{45} \int^{3} \sqrt{u^{2}+\frac{2025}{16}} d u \\ =\frac{4}{45} \int_{-30} \sqrt{\frac{20 answers -
6. If \( y=f(x) \) is defined parametrized as \( x(t)=2 t-t^{2} \), \( y(t)=3 t-t^{3} \), then \( y^{\prime \prime \prime}= \) ? (a) \( y^{\prime \prime \prime}=\frac{3}{8(1-t)^{3}} \) (b) \( y^{\prim2 answers -
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Let \( y=\int_{1-3 x}^{1} \frac{u^{3}}{1+u^{2}} d u \). Use the Fundamental Theorem of Calculus to find \( y^{\prime} \).2 answers -
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Find the derivative for each of the expressions:
\( y=9^{6 x^{4}+2 x^{2}+1} \) \( y=\sec ^{3}\left(7 x^{\frac{2}{3}}\right) \) \( y=\log _{4}(\cot (3 x)) \) \( y=\ln (\sqrt[7]{3 x+2}) \) \( y=\arccos \left(\frac{1}{x^{5}}\right) \) \( f(x)=e^{\csc2 answers -
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If \( \frac{d y}{d x}=2-y \), and if \( y=1 \) when \( x=1 \), then \( y= \) (A) \( 2-e^{x-1} \) (B) \( 2-e^{1-x} \) (C) \( 2-e^{-x} \) (D) \( 2+e^{-x} \)2 answers -
please solve #4
\( \begin{array}{l}f(x, y)=\frac{x}{(x+y)^{2}} \\ g(x, y)=y \tan (x+2 y)\end{array} \)2 answers -
3. Find the general solution. (a) \( y^{\prime \prime \prime}-y^{\prime \prime}-6 y^{\prime}+6 y=0 \) (b) \( y^{(6)}-64 y=0 \)2 answers -
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For \( f(x, y, z)=3 x^{2}-2 x^{3} y+2 y^{4} \), compute \( \frac{\partial f}{\partial x}(x, y) \) \[ \frac{\partial f}{\partial x}(x, y)= \]2 answers -
Suppose \( f(x, y)=x y^{2}-2 \). Compute the following values: \[ \begin{array}{r} f(3,-3)= \\ f(-3,3)= \\ f(0,0)= \\ f(-3,-3)= \\ f(t, 2 t)= \\ f(u v, u-v)= \end{array} \]2 answers -
Given \( f(x, y)=-\left(8 x^{5} y+8 x y^{5}\right) \) \[ \frac{\partial^{2} f}{\partial x^{2}}= \] \[ \frac{\partial^{2} f}{\partial y^{2}}= \]2 answers -
Calculate all four second-order partial derivatives of \( f(x, y)=(4 x+2 y) e^{y} \). \[ f_{x x}(x, y)= \] \[ f_{x y}(x, y)= \] \[ f_{y x}(x, y)= \] \[ f_{y y}(x, y)= \]2 answers -
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