$\frac{\sin x}{\cos x}-\frac{\cos x}{\sin x}$
$7\left(7+8k\right)+4\left(9+9k\right)$
$e^x\left(\frac{dy}{dx}+1\right)=1$
$\frac{2x^2+11x+17}{x+4}$
$2x^2+8y-8xy$
$\left(2x^4\right)\left(y^{-3}\right)$
$-m-n-x\left(m+n\right)$
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