$n^2+19n+60$
$\frac{1}{\sin\left(x\right)^2}-\frac{1}{\tan^2\left(x\right)}$
$\int_0^1\left(15e^{-x}+1\right)^2dx$
$\frac{1}{sec^2x}dx+\frac{1}{cscy}dy=0$
$\frac{x^2-2x}{\sqrt[20]{x-1}-1}$
$1+\frac{x^2-5x-24}{3x}=\frac{x-6}{3x}$
$100-400+30$
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