Eliminate \( \theta \) and \( \phi \) from the equations \[ a \cos ^{2} \theta+b \sin ^{2} \thet...
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0Eliminate \( \theta \) and \( \phi \) from the equations
\[
a \cos ^{2} \theta+b \sin ^{2} \theta=c, b \cos ^{2} \phi+a \sin ^{2} \phi=d \text { and } a \tan \theta=b \tan \phi
\]
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