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If sintheta+sin^(2)theta+sin^(3)theta=1,...

If `sintheta+sin^(2)theta+sin^(3)theta=1`, then find the value of `cos^(6)theta-4cos^(4)theta+8cos^(2)theta`.

A

2

B

3

C

4

D

0

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The correct Answer is:
C
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