Jee Main
Trigonometric Functions And Equations
JEE Main 2022 (Online) 29th June Morning Shift
INTEGER+4 / -12022
The number of elements in the set \(S = \{ \theta \in [ - 4\pi ,4\pi ]:3{\cos ^2}2\theta + 6\cos 2\theta - 10{\cos ^2}\theta + 5 = 0\}\) is __________.