The number of elements | TRIGONOMETRY

JEE MAIN 2022

29-06-22 S1

Question

The number of elements in the set $S=\left\{\theta \in[-4 \pi, 4 \pi]: 3 \cos ^2 2 \theta+6 \cos 2 \theta-10 \cos ^2 \theta+5=0\right\}$ is $\_\_\_\_$

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JEE Main

Mathematics

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