$\frac{1+csc\left(x\right)}{csc\left(x\right)}$
$\frac{\tan x\sin x}{\sec x-1}=1+\cos x$
$\left(3+n\right)^5$
$7xy^2+18xy^2+xy^2$
$\int3e^{7x}dx$
$n^2-n-90$
$1-\sin\left(n\right)^2$
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