$\int\:\frac{4x}{x^2+2x-3}dx$
$\theta\left(1-\cos^{2}\theta\right)=\sen\theta$
$5z^2-2y^2+14+8x^2+9y^3-4z^2-x^2$
$\left(a-3\right)\left(2a+7\right)$
$\cos\left(37+x\right)$
$2x^2+8x+9$
$7b-6-8b$
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