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

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

A

`(a^(2))/(b^(2))`

B

`(a)/(b)`

C

`(b)/(a)`

D

`(a^(2)+b^(2))/(a^(2)-b^(2))`

Text Solution

Verified by Experts

The correct Answer is:
B

`(sin(x+y))/(sin(x-y))=(a+b)/(a-b)`
On applying componendo and dividendo rule, we get
`(sin(x+y)+sin(x-y))/(sin(x+y)-sin(x-y))=((a+b)+(a-b))/((a+b)-(a-b))`
`(sinxcosy)/(2cosxsiny)=(2a)/(2b)`
`implies(tanx)/(tany)=(a)/(b)`
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