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If sin^(2) theta=(cos 2 alpha cos 2 beta...

If `sin^(2) theta=(cos 2 alpha cos 2 beta)/(cos^(2)(alpha+ beta))` then, show that one value of `"tan"^(2) (theta)/(2) " is " "tan" ((pi)/(4)-alpha) "tan" ((pi)/(4)+beta)`.

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