$\int sin\left(2x\right)sin\left(6x\right)\:dx$
$\int\:t\cdot\:\ln\:\left(t+1\right)dt$
$\int\frac{4x^4-4x+2}{x^3}dx$
$\frac{-2+3x+4x^2+x^3}{x+3}$
$2\cdot\log\left(3\right)=\log\left(3x\right)$
$\frac{3x^4-2x^2+5x-30}{x+2}$
$\left(1-9xy\right)\left(9xy+1\right)$
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