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If 1+^n C1costheta+^n C2cos2theta+........

If `1+^n C_1costheta+^n C_2cos2theta+........ +^n C_n` equals

A

`(2cos"" theta/2)^ncos""(ntheta)/2`

B

`2 cos^2 ""(ntheta)/2`

C

`2 cos^(2n) ""(ntheta)/2`

D

`(2cos^2""theta/2)^n`

Text Solution

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The correct Answer is:
A
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