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If (a+b)tan(theta-varphi)=(a-b)tan(theta...

If `(a+b)tan(theta-varphi)=(a-b)tan(theta+varphi),\ t h e n(sin(2theta))/("sin"(2varphi))` is equal to a.`a b` b. `a/b` c. `b/a` d. `a^2b^2`

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ALLEN-TRIGONOMETRIC RATIOS AND IDENTITIES-All Questions
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