$42-\left(-36\right)$
$\frac{2a^{2}+5a+2}{2a^{3}+a^{2}-8a-4}$
$2a+50+4a$
$\left(7x^4-12x^3+2x^2-x+7\right)+\left(12x^3-16x^2+4x\right)$
$2\:cos\:\left(z\right)\:+\:6\:cos^{-1}\left(z\right)$
$\int\frac{x^2}{\sqrt{49+x^2}}dx$
$\left(m^2+6m\right)^2$
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