$z=xy^5$
$3x-2y=1\:$
$\frac{2x^6x\:4x^3}{24x^5}$
$\left(\sqrt{3+1}\right)^2-\left(\sqrt{3-1}\right)^2$
$\frac{1}{cot^2x}+sec\left(x\right)cos\left(x\right)$
$7x-7=7$
$x^2-12x-9=0$
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