$1-sin\left(\theta\right)=2cos^2\left(\theta\right)$
$\lim_{x\to0}\left(\frac{cot\left(x\right)}{csc\left(x\right)}\right)$
$4xy+3y$
$x^2+10x-39$
$\left(a+3\right)\:\left(-5+a\right)$
$\left(y^2+3x\right)dx+2xydy=0$
$tan\left(x+\frac{\pi\:\:}{\:4}\right)=\frac{tan\:x\:+1}{1-tan\:x}$
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