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  4. The number of solutions of the equation sin 4 θ-2 sin 2 θ-1=0 which lie between 0 and 2 π is

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Q. The number of solutions of the equation $\sin ^4 \theta-2 \sin ^2 \theta-1=0$ which lie between 0 and $2 \pi$ is

Trigonometric Functions

Solution:

Correct answer is (a) 0