$\frac{1}{3}x+\frac{4}{5}x$
$-\sqrt{361}$
$\left(2x-y\right)^2-\left(2x-y\right)\left(2x+2f\right)+\left(x+f\right)^2$
$\int x^1\cdot e^{\frac{-2x}{a}}dx$
$\frac{1}{\sqrt{n+1}}$
$4^2^1^2$
$x^2+7x+7$
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