$\sqrt{sec^2a\:+\:cosec^2a}=\:tan\:a\:+\:cot\:a$
$-2.5-3.5x=1.5x+16$
$\frac{-2}{5}\cdot20$
$x ^ { \frac { x } { x } }$
$2x\left(2\right)-3x$
$\int\:\frac{2x^3-4x^2-15x}{x^2-2x-8}dx$
$\frac{2x^5+3x^4-9x^3+x-21}{x+2}$
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