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If (sin(x+y))/(sin(x-y))=(a+b)/(a-b) , s...

If `(sin(x+y))/(sin(x-y))=(a+b)/(a-b)` , show that `(tanx)/(tany)=a/b` .

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RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS OF COMPOUND ANGLES-All Questions
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