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Question

If sinx+sin2x=1 , then the value of cos2x+cos4x is

A
0
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B
2
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C
1
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D
3
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Solution

The correct option is C 1
sinx+sin2x=1
1sin2x=sinx
cos2x=sinx
Thus,
cos2x+cos4x=sinx+sin2x=1
Hence, option c is correct

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