$\int\frac{x+4}{\left(x^2-5x-6\right)}dx$
$y=\frac{3^{x+1}}{\cos x}$
$\csc^2x-2=0$
$\left(\frac{1}{4}y-2\right)\left(\frac{1}{4}y+2\right)$
$n^2+8ny+16y^2$
$77^2-22^2$
$\frac{d}{dx}\left(x^2+y^2-xy+7=16\right)$
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