$12-\left(14-\left(9-15\right)+6\right)$
$8x^2-36y^2$
$\int x^2\cdot e^{-6x}dx$
$\frac{a}{4}^4-a^2b+b^2$
$\:\left(a+b\right)^2-\left(b-a\right)^2$
$\int_0^{\pi}\left(\frac{1}{2-cos\left(\frac{x}{2}\right)}\right)dx$
$\frac{x^{12}-y^{12}}{x^4-y^4}$
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