$5\cdot2^{-3}+7\cdot4^{-2}$
$\left(\sqrt{5}-2\right)-\left(\sqrt{5}+2\right)$
$\frac{cot\left(x\right)}{1+cot^2\left(x\right)}$
$12\:x-3\:x^2+9+5\:x^2-x^2-8\:x-30$
$\int\left(x+3\right)\sqrt{4-x}dx$
$2\csc x+1=\csc x+3$
$\left(x+3\right)^2\left(x-3\right)^2-6<0$
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