$\frac{dy}{dx}=\frac{-\left(cos\left(x\right)sen\left(x\right)-xy^2\right)}{y-yx^2}$
$\lim_{x\to0}-\left(cscx-cotx\right)$
$2x^4+x^2-4x-1+4^4-2x$
$\left(5x^2+3y\right)\left(6x^2-5y\right)$
$-11k+13-g+5g+7+3k$
$\int x^6\sqrt{x^7+6}dx$
$4\sin^2x=1$
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