$2\cos x-1=-4\cos x+2$
$9a-6a+a^2$
$a+2y=b$
$f\left(x\right)=5\sqrt{x^3}+7x-4$
$-3-\left(-1-11\right)$
$\int\frac{2}{2\sqrt{1+e^{2x}}}dx$
$\left(2-3x^2\right)^3$
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