$0\frac{4^{2}}{4^{3}}$
$\frac{-y^3x^2}{-4z^4x^2}$
$9x^2+36y^2+4z^2=36$
$\left(\frac{1}{3}x^{2}+\frac{5}{2}y\right)^{2}$
$-7=1+\frac{x}{3}$
$\frac{cot\left(x\right)}{cos^3\left(x\right)}-\frac{1}{cos^2\left(x\right)}\:=\:\frac{csc\left(x\right)}{1+sen\left(x\right)}$
$4x-2x^2=1$
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