Offline paper
Mathematics · 2016
JEE Main 2016 · 2016-04-03 Offline · Q88
If 0 ≤ x<2 π, then the number of real values of x, which satisfy the equation cos x+ cos 2 x+ cos 3 x+ cos 4 x=0, is:
If $\displaystyle 0 \leq x<2 \pi$, then the number of real values of $\displaystyle x$, which satisfy the equation $\displaystyle \cos x+\cos 2 x+\cos 3 x+\cos 4 x=0$, is :
Official answer
(3)
$\displaystyle 7$
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JEE Main 2016 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.