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If 3 tan theta tan phi=1, then prove tha...

If `3 tan theta tan phi=1`, then prove that 2 `cos (theta+varphi)=cos (theta-varphi)`.

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To prove that if \( 3 \tan \theta \tan \phi = 1 \), then \( 2 \cos(\theta + \phi) = \cos(\theta - \phi) \), we can follow these steps: ### Step 1: Start with the given equation We have the equation: \[ 3 \tan \theta \tan \phi = 1 \] From this, we can express \( \tan \theta \tan \phi \) as: ...
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