$\frac{sin\left(x\right)}{1+\cos\left(x\right)}=csc\left(x\right)-cot\left(x\right)$
$\left(1+\tan\left(y\right)\right)^2-\sec^2y=2\tan\left(y\right)$
$4x^2-12xy$
$x^2-16x+5$
$\left(x^n-2y^n\right)^2$
$9x^2+144x+64$
$x\:2\:-\:x\:-\:72\:=\:$
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