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If sin x+sin^(2)x=1, " then " cos^(8)x+...

If `sin x+sin^(2)x=1, " then " cos^(8)x+2 cos^(6)x+cos^(4)x=`

A

2

B

1

C

3

D

`(1)/(2)`

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The correct Answer is:
B
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VIKAS GUPTA (BLACK BOOK) ENGLISH-COMPOUND ANGLES-Exercise-5 : Subjective Type Problems
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