$a+5a^2+-10$
$5^2+2\cdot5\cdot b+b^2$
$x+1^2$
$\frac{d^2}{dx^2}\left(y^2x^4e^x+2\right)$
$\lim_{x\to0}\left(\frac{ln\left(cosx\right)}{55x^2}\right)$
$\csc\left(x\right)+\frac{\sin\left(-x\right)}{1+\cos\left(-x\right)}=\cot\left(x\right)$
$-\frac{10x^2}{x^3}$
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