$2x^3+21x^2$
$\int9x\left(x+5\right)^2dx$
$\left(2a+1\right)^2-\left(a+2\right)^2$
$\:cot^2\theta\:\left(sec^2\theta\:-1\right)=1$
$\lim_{x\to5}\:\frac{x^2+2x-35}{x^2-10x+25}$
$\int\left(x^2\left(x^3-7\right)^8\right)dx$
$2x^7+-6x^6$
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