यदि s = cos^(2) alpha + cos^(2) beta है,...

यदि `s = cos^(2) alpha + cos^(2) beta` है, तो `cos (alpha + beta) cos (alpha - beta)` का 's' के पदों में मान है

A

`s-1`

B

`(s-1)/(s)`

C

`s^(2)`

D

`1-s`

लिखित उत्तर

Verified by Experts

The correct Answer is:

A

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