$\left(x^2\:+\:x\:-\:1\right)^2$
$\frac{4x^2+6x+4}{x+1}=2$
$\left(7r+2\right)^2$
$11x+8+-11x+24$
$\frac{2xy}{4y^2}$
$x^2-\frac{x}{3}+\frac{1}{3}$
$\int\cos\left(x\right)\:cos^5\left(sen\:x\right)\:dx$
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