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If (cos theta(1))/(cos theta(2))+(sin th...

If `(cos theta_(1))/(cos theta_(2))+(sin theta_(1))/(sin theta_(2))=(cos theta_(0))/(cos theta_(2))+(sin theta_(0))/(sin theta_(2))=1`, where `theta_(1)` and `theta_(0)` do not differ by can even multiple of `pi`, prove that
`(cos theta_(1)*cos theta_(0))/(cos^( 2)theta_(2))+(sin theta_(1)*sin theta_(0))/(sin^(2) theta_(2))=-1`

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