$sen^4a-cos^4a-1=-2\left(1+sen^2a\right)$
$\left(2x^2+2y^2\right).\left(2x+3y^2\right)$
$\frac{\cos\left(x\right)}{-\cot\left(x\right)}$
$\sqrt{a}^2-u^2$
$\left(x+5\right)\left(x-2\right)\left(x-5\right)$
$\frac{25v^3x-20}{4v^3x}$
$\frac{x^3-8x^2-29}{x+7}$
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