$\int cos^2\left(7x\right)\cdot sin^3\left(7x\right)$
$\int\frac{\csc x\cot x}{1+\csc\left(x\right)^2}dx$
$3y^3dx=6x^2dy$
$\frac{\frac{x^6}{x}}{x}$
$x^4+8x^2+16-4x^2$
$\lim_{x\to-1}\left|x\right|$
$2004\cdot2002$
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