$\frac{-x^2}{x^2+1}$
$\cot\left(t\right)=.58$
$\left(3.5\right)^5$
$-13\left(10\right)$
$37+y=4\left(7+y\right)$
$\int\cos\left(8x\right)+\sin\left(2x\right)dx$
$sin\:2x=cos\:2y$
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