$6x^2+6$
$2cos2\left(t\right)+3cos\left(t\right)+1=0\:$
$-4+\left(-6+1\right)+3-\left|3-\left(1-2\right)+2\right|+1-7$
$\frac{3x}{2}+\frac{2x}{3}$
$\left(2y+3x^4\right)\left(-2y+3x^4\right)$
$b+b$
$\int\cos4x\left(1-\sen4x\right)^{3}dx$
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