$x = \sum_{n=0}^{\infty} cos^{2n}\ \phi = 1+ cos^2\phi + cos^4\phi + ..... = \frac{1}{1 - cos^2\phi} = \frac{1}{sin^2 \phi}$
$y = \sum_{n=0}^{\infty} sin^{2n}\ \phi = 1+ sin^2\phi + sin^4\phi + ..... = \frac{1}{1 - sin^2\phi} = \frac{1}{cos^2 \phi}$
$z = \sum_{n=0}^{\infty} sin^{2n} \phi cos^{2n}\phi= 1+ sin^2\phi cos^2\phi + ..... = \frac{1}{1 - sin^2\phi cos^2 \phi} $
અહી, $sin^2\phi = \frac{1}{x}, \ \ \ \ \ \ \ \ \ \ cos^2\phi = \frac{1}{y} $
$z = \frac{1}{1 - \frac{1}{x} \frac{1}{y}} = \frac{xy}{xy - 1}$
$\Rightarrow xyz - z = xy$
$\Rightarrow xyz = xy + z$
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