$\frac{2}{cot\left(x\right)+tan\left(x\right)}=sin\left(2x\right)$
$-50-\left(-15\right)$
$\int\:\left(\frac{x^3+4x+14}{x^2+4x+13}\right)dx$
$\left(3r+5t\right)\:^2$
$2ecx2+x$
$8\:-\:7\:+\:\left(-3\right)\:-\:\left(-3\right)\:+\:2$
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