Advanced Math Archive: Questions from November 04, 2023
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Find the limit. I lim (x, y) → (7, 6) e^√6x - y
Find the limit. \[ \lim _{(x, y) \rightarrow(7,6)} e^{\sqrt{6 x-y}} \]1 answer -
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Using De moiven form prove \[ \begin{array}{l} \cos ^{3} \theta=\cos ^{3} \theta-3 \cos \theta \sin ^{2} \theta \\ \sin 3 \theta=3 \cos ^{2} \theta \sin \theta-\sin ^{3} \theta \end{array} \]1 answer -
2. For each differential equation, find the Laplace transform of the solution \( y \) : \[ \begin{array}{cc} 3 y^{\prime}+5 y=x^{2}, & y(0)=2 . \\ y^{\prime \prime}-y=5 e^{-4 x}+2 x & y(0)=y^{\prime}(1 answer -
Verify that each of the following has the indicated solution for all values of the constants \( (a) \) and \( (b) \); 1. \( y^{\prime \prime}+4 y=0 \) \( y=a \cos 2 x+b \sin 2 x \) 2. \( y^{\prime \pr1 answer -
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f(x, y) = F(x, y) = (xy² - x6)i + (x²y + y)j
\( \begin{array}{cc} & F(x, y)=\left(x y^{2}-x^{6}\right) \mathbf{i}+\left(x^{2} y+y^{6}\right) \mathbf{j} \\ f(x, y)= & +c\end{array} \)1 answer -
Please have good reasons, thanks!
13-18 Match the vector fields \( \mathbf{F} \) with the plots labeled I-VI. Give reasons for your choices. 13. \( \mathbf{F}(x, y)=\langle x,-y\rangle \) 14. \( \mathbf{F}(x, y)=\langle y, x-y\rangle2 answers -
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Solve the initial value problem y = y" + 4xy 16y= 0, y(0) = 9, y'(0) = 0. -
Solve the initial value problem \[ y^{\prime \prime}+4 x y^{\prime}-16 y=0, y(0)=9, y^{\prime}(0)=0 \]1 answer -
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2. Solve the following. (a) \( y^{\prime}=\frac{y}{2 x} \) (b) \( y^{\prime}-2 y=3 e^{-3 x}, \quad y(0)=3 \)1 answer -
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Solve \( \frac{d^{4} y}{d x^{4}}-y=0 \), where \( y(0)=1, y^{\prime}(0)=0, y^{\prime \prime}(0)=3 \) and \( y^{\prime \prime \prime}(0)=5 \)1 answer -
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65 Prove: Sin³ A-8 sin A-2 D sin² A+2 sin Aty
Prove: \[ \frac{\sin ^{3} A-8}{\sin A-2}=\sin ^{2} A+2 \sin A+4 \]1 answer