$\left(x+2a\right)\left(x-4a\right)$
$7c-4c-5c$
$\left(-1\right)\left(+1\right)\left(-1\right)\left(+1\right)\left(+1\right)\left(+1\right)$
$\int\:\frac{x^2+2x-1}{2x^2+3x^2-2x}dx$
$\sqrt{2}\cos\left(x+45\right)+\sin x$
$4x^2+\:bx\:+\frac{b}{4}^2$
$\frac{dy}{dx}=1.321-0.01y$
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