$\left(y+20\right)^2$
$\frac{dy}{dx}=\frac{2x^2+2y}{x}$
$\frac{dy}{dx}=\frac{y}{y-x},\:y\left(5\right)=2$
$\sin^2\left(x\right)\sec^2\left(x\right)+\sec^2\left(x\right)\cos^2\left(x\right)$
$\left(-2\right)^6\cdot\left(2\right)^2$
$-2+\frac{4m}{n}$
$-y^2+2y+1$
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