$5x^3-4x^2-4x^3+3x^2$
$2z^2y^2-2z^2$
$\left(m^{-3}-\frac{5}{n}\right)^2$
$\frac{Cos\theta\:}{1-Sin\theta\:}-Tan\theta\:=Sec\theta\:$
$7x+5-x+6$
$\int\frac{2}{\left(x^2-4x+5\right)^{\frac{3}{2}}}dx$
$2x+1\:+\:2x-1\:are$
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