$\lim_{x\to\frac{\pi}{4}}\left(\frac{2-\csc^2\left(x\right)}{1-\cot\left(x\right)}\right)$
$\:7\left(7g\right)$
$x^4-x^2+\frac{9}{x}+2$
$\left(3ab+5x^2\right)^2$
$\int\cosh\left(x\right)\cosh\left(2x\right)\:dx$
$-1^2+-1^2$
$a^9-8b^6c^{12}$
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