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If sinx+sin^2x=1. then evaluate cos^8x+...

If `sinx+sin^2x=1.` then evaluate `cos^8x+2cos^6x+cos^4x`

A

0

B

-1

C

2

D

1

Text Solution

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The correct Answer is:
D
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MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS OF COMPOUND ANGLES AND FACTORIZATION FORMULAE-MCQs
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