$\frac{sen}{cos}$
$\frac{dy}{dx}=sen\:\left(x-y\right)$
$-8\left(0\right)$
$\log\left(8x+1\right)=\log\left(x^2+1\right)$
$2\left(x\:-\:2y\right)^2\:-\:18z^2$
$3a^2y+9ay^2-18a^2y^2$
$\left(2x\right)\left(y+3\right)\left(z-1\right)$
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