$sen\left(3x\right)dx+2ycos^{3\:}\left(3x\right)dy=0$
$\ln\left(x-2\right)-\ln20=\ln\left(3x+1\right)+\ln20$
$0,3+1,0$
$\left(x^4-2x^2+1\right)^2$
$\frac{d^2y}{dx^2}\left(x^2+4xy-y^2-8\right)$
$\int\frac{ln\left(5x\right)}{5}dx$
$\frac{-\pi}{6}=arctan\:x\:$
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