$\sin\left(\frac{\pi}{10}\right)\cos\left(\frac{\pi}{15}\right)+\cos\left(\frac{\pi}{10}\right)\sin\left(\frac{\pi}{15}\right)$
$e^{x+y}dx+dy=0$
$\frac{dy}{e^{\frac{y}{3}}}=e^{\frac{x}{3}}dx$
$2x+6+2x-2$
$\sqrt[2]{8x}$
$-20\cdot15$
$1yb$
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