$2-3\le-1$
$\int x\left(x+4\right)^6dx$
$\cot\left(a\right)=\frac{\csc\left(a\right)}{\sec\left(a\right)}$
$\frac{cot^2x+sin^2x}{cosx+cosecx}=cosecx-cosx$
$-2-3.2$
$-n+4-9-5n$
$\:5lnx-\frac{1}{2}lny-2ln\left(y^2+9\right)$
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