$7x+7y\:7x-7y$
$-\frac{3}{2}x^2y^2+-\frac{1}{4}x^2y^2$
$\int\:\:x^{12}\left(x^{13}+3\right)^{10}dx$
$\int4000xe^{-0.2}dx$
$f\left(x\right)=\left(2x\right)^4+5^4$
$\frac{x^2^n-y^2^n}{x^n+y^n}$
$-8x^4+3x^2\cdot2x^2$
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