$1+\frac{1}{\sin\left(x\right)\cos\left(x\right)}=2$
$15x^2-55x-20$
$-\left(\frac{-21}{-7}\right)$
$3x+4\:;\:x=4$
$\int xe^{-x-2}dx$
$2cos^2\left(x\right)-5cos\left(x\right)=3$
$\lim_{x\to-\frac{\pi}{4}}\left(2\sin\left(x\right)\cos\left(x\right)\right)$
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