$\left(2x-7y\right)^7$
$\frac{1}{cos^2\alpha\:}+\frac{1}{sen^2\alpha\:}=\frac{1}{sen^2\alpha\:\cdot cos^2\alpha\:}$
$4x^2+8xy+16y^2$
$\tan\left(x\right)\left(1-\sin\left(\left(x\right)^2\right)\right)$
$-1\left(2x^3+9x^2+9x+7\right)$
$-10xy+5y=-5y$
$\frac{dy}{dx}\left(x^{\frac{8}{x}}=y\right)$
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