$\left(6x^2+5x-3\right)+\left(x^2-9\right)$
$cot\:u\:tan\:u-cos^2u=sin^2u$
$\sin\left(x\right)^2\cos\left(x\right)^2+\cos\left(x\right)^4=\cos\left(x\right)^2$
$-\left(-2x+6\right)+3x$
$\lim_{n\to\infty}\:1+1^n$
$\int\frac{3x}{x^2-1}dx$
$-7x+y^3+7x^3+6x-3y^3-2x^3+3$
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