$\left(z+12\right).\left(z-12\right)$
$1-sen^2x-cos^2x+senx$
$2+\sec\left(x\right)\cdot\sin\left(x\right)$
$-6^2$
$\frac{dy}{dx}=\frac{1-x}{x}$
$\frac{dy}{dx}+\frac{3}{4}y=ysin^2x$
$7\left(3x+6\right)-2x$
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