Multiply the equation by the reciprocal of $x^2$
Take the inverse of $\tan\left(y\right)$ on both sides
Apply the formula: $\arctan\left(\tan\left(\theta \right)\right)$$=\theta $, where $x=y$
Applying the property of exponents, $\displaystyle a^{-n}=\frac{1}{a^n}$, where $n$ is a number
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