$-6-\left(-7\right)\left(-6-2\right)$
$-\left(-2+-6\right)+\left(9-4\right)$
$\frac { 0 } { \frac { 0 } { 2 } }$
$\int x^2\:sen\:nx\:dx$
$15abc^2-45a^2b$
$8x^2-x+3x-4x^2$
$\frac{64x^6-4^6}{2x+4}$
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