$9x^2-7xy-2x^2-xy-5x^2+8xy$
$-3x^2+2y^2-7+10x^2-12y^2+15$
$\left(5^4\right)^{-4}$
$\tan\left(x\right)+\tan\left(g\right)=xy$
$\frac{dy}{dx}=\frac{2x-3}{18y+7}$
$\lim_{x\to2}\left(x+3\right)^{5x}$
$\int\sqrt{x^4+2x^2-1}dx$
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