$\tan\left(u\right)+\cot\left(u\right)=2\csc\left(2u\right)$
$\cos\left(x\right)\left(1+\frac{1}{\sin\left(x\right)}\right)$
$2\sin^2\left(x\right)=1+2cos^2\left(x\right)$
$\frac{2x-1}{6}+\frac{x+1}{3}=\frac{3x+2}{4}+\frac{1-x\:}{2}$
$1+1+1+1+1$
$\frac{1}{x^3-2x+1}$
$\left(10\:por\:6\right)+10$
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