$\lim_{x\to3}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$v^2-7v+12$
$\left(xy+2\right)^4$
$2a-a\left(2-a\right)$
$4\infty4$
$\sin^2\left(x\right)+\sin^2\left(x\right)\cos^2\left(x\right)=1-\cos^4\left(x\right)$
$\left(2-x\right)\left(6-x\right)$
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