MathsJEE Main 5 Apr 2026, Shift 2·Q23·Numerical·Moderate

Trigonometry · Trigonometric equations

S = \left\{\theta \in [-\pi, \pi] : \cos\theta\cos\dfrac{5\theta}{2} = \cos7\theta\cos\dfrac{7\theta}{2}\right\}

, then

n(S)

is equal to .

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