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

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

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
A
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