$\sec\left(a\right)^2=\frac{\csc\left(a\right)}{\csc\left(a\right)-\sin\left(a\right)}$
$x^2-20x-8000=0$
$x^6-36y^2$
$\frac{1}{10}+\frac{-1}{10}$
$x^3+8x-27+27$
$20\left(-1.5r\right)$
$\frac{9x^6y^{10}}{3x^8y^5}$
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