Given with in the second quadrant

MATHEMATICS · Single correct · CBSE · Mathematics · Trigonometric Functions · Trigonometric Functions

Problem

Given cos⁡3θ=0\cos 3\theta = 0 with θ\theta in the second quadrant, determine the exact value of cos⁡θ\cos \theta. (a) 32\dfrac{\sqrt{3}}{2} (b) −32-\dfrac{\sqrt{3}}{2} (c) 00 (d) −12-\dfrac{1}{2}

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