$\frac{8x^2-2x}{2x}$
$\left|\left(-2\right)\right|^2$
$9^3\cdot3^3$
$\int\frac{5x^2+3x-2}{\left(x^3+2x\right)}dx$
$3x^2-8x-3$
$\frac{1}{1+\cot x}=\frac{\sin x}{\cos x+\sin x}$
$3\sin^2\left(a\right)-\cos^2\left(a\right)=0$
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