$7^2+6c-d$
$\left(-7a\right)^{-2}$
$-\frac{4}{3}\cdot\frac{9}{2}$
$\int\frac{x^3}{\left(x^2-1\right)}dx$
$\cos\left(a\right)\csc\left(a\right)\sqrt{\sec^2\left(a\right)-1}=1$
$\frac{d}{dx}\left(\cot\left(x+1\right)\right)$
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