$\int\frac{x^2-1}{x^3-3x+7}dx$
$\left(sinx+cosx\right)^2-2sinxcosx=1$
$25x^7-20x^9+15yx^{11}$
$x+x+x+y+y+2+3$
$\int\frac{x}{\sqrt[3]{x}-1}dx$
$\frac{dy}{dx},\:de\:\sqrt{2x}+\sqrt{3y}$
$\sin\left(b\right)\frac{-7}{25}$
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