$\csc\left(1\right)-\sin\left(1\right)=\cot\left(1\right)\cdot\cos\left(1\right)$
$\int\sqrt{3l}dl$
$\int\:4\:cos^3\left(8x\right)dx$
$\frac{dx}{dy}-2yx=y$
$3z+4f+2f$
$3x^2+6x+3y^2+18y+2=0$
$x^3y\left(-13y^2\right)$
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