$\lim_{x\to-\infty}\left(\frac{x\sqrt{-x}}{\sqrt{1+4x^2}}\right)$
$\sin\left(x\right)\left(9\cos\left(x\right)-1\right)$
$\csc\left(x\right)-\cos\left(x\right)\tan\left(x\right)=\sin\left(x\right)$
$\int_0^{\infty}\left(x\right)dx$
$x^4-4x+3$
$\left(\frac{a^3}{64}-\frac{b^3}{343}\right)$
$\left(7x^6-5\right)\left(7x^6+3\right)$
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