Other Math Archive: Questions from August 02, 2023
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9. Prove that tan x + tan y tan x-tan y sin(x + y) sin(x - y)
9. Prove that \( \frac{\tan x+\tan y}{\tan x-\tan y}=\frac{\sin (x+y)}{\sin (x-y)} \).2 answers -
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Problem 5 (18 points). Solve the following IVP: \[ y^{\prime \prime}-2 y^{\prime}+y=3 t+e^{t}, \quad y(0)=1, \quad y^{\prime}(0)=1 \]2 answers