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Let P(x)=sqrt(( cosx +cos2x+cos3x)^2+ (s...

Let `P(x)=sqrt(( cosx +cos2x+cos3x)^2+ (sin x + sin 2x+sin3x)^2)` then P(x) is equal to

A

`1+2 cosx`

B

`1+sinx`

C

`1-2cosx`

D

None of these

Text Solution

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The correct Answer is:
D
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