$2x-10x$
$t^4+2t^33t^2-4t+4\:entre\:t-2$
$\frac{1}{2}tan^2+\frac{cos2x}{2cos^2}=\frac{1}{2}$
$q^2-\frac{q}{4}$
$36x^4-42x^2$
$\int\frac{x^2+2x-1}{x^3+3x^2+2x}dx$
$1-2sinxcosx=1-sin2x$
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