$\left(x^2-4\right)\left(x^2-4x\right)$
$\sin^2x\cdot\csc^2x-\cos^2x=\sin^2x$
$3q^2k+6q^2k$
$f\left(5\right)=\left(5t+2\right)^2$
$\left(s-2\right)^2$
$\lim_{x\to0}\:\left(x^4\right)\cdot sin\left(\frac{1}{x}\right)$
$4\left(3x^2+7\right)^5$
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