Question
Solve: $3 e^x \tan y d x+\left(1+e^x\right) \sec ^2 y d y=0$. Also, find the particular solution when $x=0$ and $y=\pi$.
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$\int_0^1 t^5 \sqrt{1-t^2} d t$
$(x-y)^2 \frac{d y}{d x}=a^2$