If for an acute angle

MATHEMATICS · Single correct · CBSE · Mathematics · Introduction to Trigonometry · Introduction to Trigonometry

Problem

If sin⁡θ=513\sin \theta = \dfrac{5}{13} for an acute angle θ\theta, find cos⁡θ\cos \theta. (a) 813\dfrac{8}{13} (b) 512\dfrac{5}{12} (c) 1213\dfrac{12}{13} (d) 144169\dfrac{144}{169}

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