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$\left(-3x^2+6\right)\left(-3x^2-6\right)$
$\int\left(x^2\:+\:1\right)\:sen\:x\:dx$
$\int\left(1-x\right)e^{1+x}dx$
$-1^{\frac{4}{3}}$
$\sqrt{x^2+6x}=4$
$-61-121$
$\cos^3x=-\cos x$
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