यदि sinx+sin^(2)x=1 तब cos^(8)x+2cos^(6...

यदि `sinx+sin^(2)x=1` तब `cos^(8)x+2cos^(6)x+cos^(4)x=`

A

A)0

B

B)1

C

C)2

D

D)4

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