$\frac{-14}{\tan^2x}$
$7+\left(-5\right)-\left(-5\right)+5+\left(-5\right)$
$\left(x+2x\right)^{-3}$
$\frac{5y}{2\sqrt{y-5}}$
$x\sqrt{x^2}+1$
$\int\:\:sen^7\left(3x\right)cos\left(3x\right)dx$
$7\:sin^2\:t\:\left(1\:+\:cot^2\:t\right)$
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