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If m sin (alpha+beta) = cos (alpha-beta)...

If `m sin (alpha+beta) = cos (alpha-beta)`, prove that
`(1)/(1- m sin 2 alpha)+(1)/(1-m sin 2 beta)=(2)/(1-m^(2))`.

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ARIHANT MATHS-TRIGONOMETRIC FUNCTIONS AND IDENTITIES-Exercise (Subjective Type Questions)
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