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If cos 5theta=a cos theta + b cos^(3)the...

If `cos 5theta=a cos theta + b cos^(3)theta+c cos^(5) theta+d`, then

A

`a=20`

B

`b =-30`

C

`a+c+c=2`

D

`a+b+c+d=1`

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The correct Answer is:
D
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