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If x cos alpha + y sin alpha = x cos bet...

`If x cos alpha + y sin alpha = x cos beta + y sin beta "then"`
`(2(1-cos (alpha - beta)))/(cos beta - cos alpha)^(2)=`

A

`(x^(2)-y^(2))/y^(2)`

B

`(x^(2)+y^(2))/y^(2)`

C

`(x+y)/y`

D

`(x-y)/y`

Text Solution

Verified by Experts

The correct Answer is:
B
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