$x^2-2x-39$
$\frac{2}{x^2\left(x^2+4x+9\right)}$
$\int\frac{x+3}{\left(x^2-9\right)\left(x^2-1\right)}dx$
$-16:-4\:+\:2\:x\:-7$
$-2+3a-4b+b-a$
$\frac { 7 a } { a }$
$\cot^2\left(x\right)=11-\csc\left(x\right)$
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