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यदि cos^(4) x को a cos (4x) + b cos (2x)...

यदि `cos^(4) x` को `a cos (4x) + b cos (2x) + c` के रूप में व्यक्त किया जाता है जहाँ a, b तथा c नियतांक है, तो (a + b + c) का मान बराबर है : (i) 1 (ii) `(11)/(8)` (iii) `(7)/(4)` (iv) 2

A

1

B

`(11)/(8)`

C

`(7)/(4)`

D

2

लिखित उत्तर

Verified by Experts

The correct Answer is:
A
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