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If (sin(alpha+beta))/(sin(alpha-beta)) =...

If `(sin(alpha+beta))/(sin(alpha-beta)) = (a+b)/(a-b)`, then prove that a `tan beta = b tan alpha`.

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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-TRIGONOMETRIC RATIOS UPTO TRANSFORMATIONS-EXERCISE - 6(C)
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  13. Find the expansion of cos(A-B-C).

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