$\frac{x^3+3x^2+5x+9}{x+1}$
$3x^3+5\:\left(x-4\right)$
$\left(3x-2\right)^2-2\left(3x-2\right)\left(5y-4\right)+\left(5y-4\right)^2$
$\left(x^3+13\right)\left(x^3+4\right)$
$5\cos^2x=2\cos x$
$2-\sec\left(x\right)^2=1-\:tan\left(x\right)^2$
$\frac{d^{15}}{dx^{15}}\left(cos3x\right)$
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