$\cos^2\theta\:=1$
$\left(3x+2\right)\left(2x+4\right)$
$5+3-\left(-8-9\right)+2+1$
$f\left(x\right)=\left(x-1\right)\left(x^2-3x+2\right)$
$\left(x^5y^3\right)^4$
$-6k=42$
$\lim_{x\to\frac{\pi}{4}}\left(\frac{tan\left(x\right)-cot\left(x\right)}{4x-\pi}\right)$
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