$\:\:\left(3z\:+\:\:1\right)\:\:\left(z\:-\:3\:\right)$
$10cosb+6=4cosb+4$
$\int\frac{x^2+1}{x\left(x-1\right)\left(x+1\right)\left(x-2\right)}dx$
$4x^4-37x^2$
$\log_x\left(\frac{1}{4}\right)=-1$
$\cos\left(-x\right)+\cos\left(-x\right)\tan^2\left(-x\right)$
$\left(x^2\right)\left(abc+1\right)$
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