$\left(-3\:-2\:+\:7\right)\:+\:\left(-5\:+\:4\:-\:6\:+\:2\right)+\:8$
$\int\:\:t^2\sqrt{t-1}dt$
$15.320-20.512$
$\frac{cot\:\left(\theta\:\right)\:-\:tan\left(\theta\:\right)}{Sen\left(\theta\:\right)\:+\:cos\left(\theta\:\right)}$
$a+b+b-a$
$x^2-x-42$
$\frac{d}{dx}5x$
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