$6-\left(-2\right)+\left(-5+3-1\right)+\left(-4\right)-2+\left(-1\right)$
$\left(\frac{2x+1}{3x^2-2}\right)^4$
$\left(a-b\right)^3\left(a^2+ab+b^2\right)$
$2\left(9x-8\right)$
$375\cdot2$
$cos^2\theta\:\:sen^2\theta\:+tan^2\theta\:\:cos^2\theta\:=1$
$tan\:\theta\:\:csc\:\theta\:\:cos\theta\:\:=\:1$
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