$5cos\left(8x\right)sin\left(5y\right)=7$
$x^2y-y-zy$
$\left(2x^{m+n}+3\right)\left(7x^{m+n}-9\right)$
$x^2-400x$
$\frac{\sin w+\cos w}{\sin w}=1+\frac{1}{\tan w}$
$\frac{6x-1}{\left(2x-1\right)x^3}$
$-13x^3y^3\left(15x^5y^5\right)$
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