$\left(x-2y^2\right)\left(x+4y^{-2}\right)$
$x-4=\frac{x}{2}-2\left(2-\frac{x}{4}\right)$
$24h^2+15hk-9k^2$
$2sinxcosx+1$
$cos\left(x\right)cos^2\left(y\right)+cos\left(x\right)sin^2\left(y\right)=cos\left(x\right)$
$9cos\left(2x\right)=9sin^2\left(x\right)+5\:$
$y2\:-\:144$
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