$\int\frac{1}{x^2\sqrt{9+4x^2}}dx$
$4cos2x-3cosx$
$30-\left(-27\right)$
$\left(n+1\right)+\left(n+1\right)$
$11x+9-7$
$\left(2^2+2\left(2\right)+2\right)e^{-2}$
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