$\frac{\cot\left(-x\right)}{\csc\left(x\right)}=-\cos\left(x\right)$
$\left(3a^7\right)^2$
$\lim_{x\to\infty}\left(\frac{\tan x-x}{x^3}\right)$
$36x^2-48xy+16$
$\lim_{h\to0}\left(\frac{\sqrt{66-4\left(x+h\right)}-\:\sqrt{66-4x}}{h}\right)$
$f\left(x\right)=5\left(x^3+2\right)^2$
$\left(7-6y\right)\left(49+42y+36y^2\right)$
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