If for an acute angle

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

Problem

If cos⁡α=513\cos \alpha = \dfrac{5}{13} for an acute angle α\alpha, then sin⁡(90∘−α)\sin(90^\circ - \alpha) equals (a) 135\dfrac{13}{5} (b) 1213\dfrac{12}{13} (c) 513\dfrac{5}{13} (d) 512\dfrac{5}{12}

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