$\frac{d}{dx}\:\left(1+\frac{9}{x}\right)^x$
$\frac{d}{dx}\left(\frac{-1}{1+x^2}+\frac{-1}{x}\right)$
$\int7e^{9x}dx$
$\left(5a^2b-8\right)\left(5a^2b+8\right)$
$8-3c=8+2c$
$\int\left(-y\right)dy$
$3\left(1+2x\right)+\left(3-x\right)+4\left(x+1\right)-1$
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