$\left(-27\right)-\left(-31\right)$
$9x^3+3x^3+2x^3$
$\lim_{x\to\infty}\left(1+e^{-x}\right)^{e^{2x}}$
$9^2-80-100$
$4x^3y+x^4y'=3\cdot sec^2x\cdot tanx$
$\int\frac{8x}{\left(5+4x^2\right)^3}dx$
$\left(x+m\right)\left(x+y\right)$
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