$\frac{sec\left(x\right)}{1-sec\left(x\right)}-\frac{sec\left(x\right)}{1+sec\left(x\right)}$
$0.08-1$
$x^3-4x^2+2x-5\left(-8x^4+5x^2-10x-15\right)$
$\frac{2}{1-cosx}+\frac{2}{1+cosx}=4csc^2x$
$6x^2+7x-3=0$
$2ydx+e^{\left\{-3x\right\}}dy$
$\frac{6x^2-3xy}{2xy^2-4x^2y}$
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