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(cosx-cosy)^(2)+(sinx-siny)^(2)=?...

`(cosx-cosy)^(2)+(sinx-siny)^(2)=?`

A

`4sin^(2)( (x-y)/(2))`

B

`4cos^(2)((x-y)/(2))`

C

`4sin((x+y)/(2))sin((x-y)/(2))`

D

`4cos((x+y)/(2))cos((x-y)/(2))`

Text Solution

Verified by Experts

The correct Answer is:
A
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