$\frac{1}{\tan x\cos x}=\csc x$
$-1-\left(-5-6\right)$
$\lim_{x\to\infty}-6x+20$
$w^2+4wv+4v^2$
$10-2\left(11x-3\right)$
$x^4-\:3x^2+9$
$2\cos\left(2x\right)+6\cos\left(x\right)-2$
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