$3csc^2\left(x\right)=\csc\left(x\right)$
$-\frac{3}{x^2+x-2}$
$3x^2-27<0$
$\cot\left(0.2774\right)$
$\frac{45}{tan\:\left(32\right)}$
$\lim_{x\to a}\left(\frac{x-7}{\sqrt{x-4}-\sqrt{3}}\right)$
$6sin^2x-5cosx-2=0$
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