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JEEMAIN PAST PAPERS
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2016
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Q)
If $0 \leq x \leq 2\pi$, then the number of real values of $x$, which satisfy the equation $\cos x+\cos 2x+\cos 3x+\cos 4x=0$, is :
( A ) 3
( B ) 9
( C ) 7
( D ) 5
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