$x\frac{dy}{dx}-y=2x^3y$
$217+491$
$\left(7a\:+\:5\right)\left(7a\:-\:2\right)$
$\frac{\left(x^5+3x^4-7x^2-8x+1\right)}{\left(x+1\right)}$
$54a^2b^3c^4-60a^3b^4c^5+48ab^2c^3$
$sin\left(80\right)cos\left(20\right)-cos\left(80\right)sin\left(20\right)$
$2x-1<61$
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