$\int_2^{\infty}\left(\frac{2lnx}{x}\right)dx$
$-z+y-3z=-1$
$cos\left(y-x\right)cos\left(x\right)-sin\left(y-x\right)sin\left(x\right)$
$\:\:\:y\left(y\:+\:15\right)\:+\:3$
$\left(7y+x+2\right)dx=\left(5y+3x+6\right)dx$
$\left(3x^2\:-\:2y^2\right)\:^2$
$\left(x^4-2\right)\:\left(x^4+5\right)$
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