$\left(\:1+sec\:\theta\:\:\right)\left(2-csc\:\theta\:\right)=0$
$\sqrt{18x^4y^6}$
$x+\frac{2}{5}\sqrt{x^5}$
$7x+9=3+9x$
$y^2-10y-5$
$\sin^2x\left(1-\csc^2x\right)=-\cos^2x$
$xy^{-2}\cdot x^{-1}y^{-2}$
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