$3+9x-4$
$csc\left(x\right)cot\left(x\right)+3csc\left(x\right)=0$
$\int2xa^xdx$
$\left(\frac{\left(k^{-2}k^8\right)}{k^3}\right)^2$
$4\sqrt{12x^4y\:}-\:5\sqrt{3x^2y}\:+\:\sqrt{75x^6y^3}$
$\int x\sec^2\left(9x\right)dx$
$\int20xe^{5x^2}dx$
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