$\frac{d}{dx}x^2+cy^2=1$
$7 x ^ { 4 } y + 5 x ^ { 2 } y + 10 x$
$-20ab+11+6ab$
$25x^4-9y^2$
$\lim_{x\to0}-\frac{4}{x}$
$\cot\left(x\right)\cos\left(x\right)+\frac{-\cos\left(x\right)}{\sec\left(x\right)+\tan\left(x\right)}$
$\lim_{x\to\frac{5}{2}}\left(\frac{-2}{\sqrt{2x-5}}\right)$
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