$\cos x=3\cos x-2$
$\left(x^{a-1}+2x^{a-3}\right)^2$
$11b+9b$
$\sqrt{3}+\sqrt{3}-5\sqrt{3}$
$\left(2x^2-3\right)^4-\left(2x^2+3\right)^4$
$\int\frac{\left(\ln\left(x\right)\right)^6}{x}dx$
$6-4\cdot3-2$
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