$\left(4anbx\right)\left(-abx\right)$
$-145-500$
$\left(4x^2\:+\:2x\:-\:8\right)\left(3x^2\right)$
$\csc\left(x\right)-\frac{1}{\csc\left(x\right)+\cot\left(x\right)}$
$x^6+8x^2+\frac{16}{x^2}$
$\lim_{x\to0}\left(\frac{x}{\sqrt{4+x}-\sqrt{4-x}}\right)$
$\int-3\cos\left(4x\right)dx$
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