$\left(a+1\right)\left(a-1\right)\left(a^2+1\right)-a^4$
$\lim_{x\to\frac{\pi}{2}}\left(-\tan\left(x\right)\right)$
$3x^3+6x^2-12-9$
$10y-4m$
$\int e^{-2x}\cos\left(2x\right)dx$
$\left(x^2+4\right)\left(x-2\right)\left(x+2\right)x$
$cscxtanx-\frac{3}{2}=0$
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