Offline paper
Mathematics · 2017
JEE Main 2017 · 2017-04-02 Offline · Q88
If 5( tan^2 x- cos^2 x)=2 cos 2 x+9, then the value of cos 4 x is:
If $\displaystyle 5\left(\tan ^2 x-\cos ^2 x\right)=2 \cos 2 x+9$, then the value of $\displaystyle \cos 4 x$ is :
Official answer
(3)
$\displaystyle -\frac{7}{9}$
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JEE Main 2017 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.