$4x^2\left(x+1\right)\left(x-1\right)\left(x+1\right)$
$12x-10=-13+9x$
$7p-11+p-15$
$\lim_{x\to2}\frac{\sqrt{2.x+1}-3}{x^2-6x+8}$
$\frac{cot^2x}{csc\:x+1}=\frac{1+sinx}{sinx}$
$\left(x^4-y^4\right)\left(x^2-y^2\right)$
$\frac{1}{3}-2x<3$
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