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Trigonometric Functions: JEE Mains 2022 June 29 Shift 1

Medium· Trigonometric equations· +4 / 0

The number of elements in the set

S=\{\theta\in[-4\pi,4\pi]:3\cos^22\theta+6\cos2\theta-10\cos^2\theta+5=0\}

is ______.

Your answer (numerical)

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