$\int\frac{sin\:x\:+\:tan\:x}{tan\:x}dx$
$\frac{4x^2-9^1}{x+1}$
$\lim_{x\to3}3x^3-8$
$20xy^2-5xy+10x^2y-5x^2y^2$
$\left(4+2\right)\cdot\left(3-5\right)-2\cdot7$
$2u\:-\:6u$
$36z^4-36z^2y+3y^2$
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