$\int3cos\:\left(\frac{-1+x}{2}\right)dx$
$1-2tan^2x=-tan^2x$
$\left(x+5\right)\cdot\left(x-3\right)$
$x^4+4x^3-16x=0$
$\int_0^{\pi}\left(cos\left(t+tn\right)\right)dt$
$\left(3-a\right)\left(5+a\right)$
$2xa^2\:\cdot\:\left(-3x^2a\right)\:\cdot\:2$
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