$\int\:\cos^3\left(15x\right)dx$
$\left(x^2+3x-2\right)\left(x^2-3x-2\right)$
$\frac{x}{x-4}+\frac{-3}{4-x}$
$a^2+4a+a$
$x^{4}-6x^{3}-21x^{2}+74x+168$
$-20x^2+100x-45$
$\left(3\cdot4\cdot6\right)^5$
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