$\left(2a+3+2a^2+3a-5\right)+\left(-3a^2-5a^2+a\right)$
$\cos^2\left(a\right)\left(1+\cos\left(a\right)\right)$
$\left(11\right)\left(-0.25\right)\left(-2\:\frac{3}{5}\right)$
$x^4+64^4$
$\left(2x-30\right)\cdot\left(80\right)$
$\lim_{x\to\infty\:}\left(2x^2e^{-x}\right)$
$\frac{dy}{dx}=\frac{x^2+10y^2}{3xy}$
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