$3\cos^2\left(x\right)-2=1-3\sin^2\left(x\right)$
$21+x=26$
$4x^2-12x$
$\int\frac{x-3}{6x^{2}+13x+5}dx$
$\left(3x^2+7x-5x-8\right)\left(4x^3-2x^2\right)$
$\lim_{x\to-2}\left(\frac{5x\left(3+\sqrt{7-x}\right)}{x^3+8}\right)$
$\int x^5e^{1-x^6}dx$
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