If and is an obtuse angle

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

Problem

If sin⁡x=725\sin x=\dfrac{7}{25} and xx is an obtuse angle, determine cos⁡x\cos x. (a) 2425\dfrac{24}{25} (b) −2425-\dfrac{24}{25} (c) −724-\dfrac{7}{24} (d) −325-\dfrac{3\sqrt{2}}{5}

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