$2m^{-2}n^2\cdot m^2n^3$
$\:\int\sqrt{7-5x-x^2}dx$
$\int\frac{t^2+2}{t^2}dx$
$\sin^2x+5\sin x+4$
$2x-6y-4y+5y-5y^2+8y^2$
$\frac{1-\sin^2\left(x\right)}{\sin\left(x\right)\cot\left(x\right)}$
$\lim_{t\to1}\left(\frac{x^{1-t}-1}{1-t}\right)$
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