$csc\left(x\right)+\:cot\left(x\right)=\frac{sin}{1\:-\:\cos\left(x\right)}$
$\frac{d^2}{dx^2}\left(4x+6\right)$
$\left(x^3+8\right)+\left(x+2\right)$
$\cos^4\left(0\right)$
$2\left(4-5\right)-3\left(5+2\right)$
$\frac{a^4b^2-a^2b^4}{a^4b^4}$
$ax^2+6x+9$
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