If and is an acute angle

MATHEMATICS · Single correct · GCSE · Mathematics · Geometry and Measures · Geometry and Measures

Problem

If 4cos⁡2θ=14\cos^{2}\theta = 1 and θ\theta is an acute angle, then θ\theta is (a) 75∘75^\circ (b) 30∘30^\circ (c) 60∘60^\circ (d) 120∘120^\circ

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