$cos\left(x\right)cos\left(y\right)-sin\left(x\right)sin\left(y\right)$
$1-sec^2x=-tan^2x$
$39-\left(-90\right)$
$\left(7r-3\right)^4$
$4n^2-16x+16$
$\frac{\left(2a^2+2ab\right)}{3a^2b}$
$sin\left(x\right)+\sin\left(x\right)\cot^2x=\csc\left(x\right)$
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