# How do you prove (1 - sin2x) / (cos2x) = (cos2x) / (1 + sin2x)?

${\cos}^{2} 2 x = \left(1 - \sin 2 x\right) \left(1 + \sin 2 x\right)$
${\cos}^{2} 2 x = \left(1 - {\sin}^{2} 2 x\right)$