$\tan\left(x\right)+\cot\left(x\right)-2\csc\left(2x\right)$
$4x^2+3y^2+121y^2$
$xy'\:-y=2x^2\cos\:\left(2x\right)+1$
$x^6-2x$
$\left(9x-4\right)\left(9x+11\right)$
$\int\left(3x^2\cdot\left(6x^3+5\right)^9\right)dx$
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