If lies in the interval and

MATHEMATICS · Single correct · A Level · Mathematics · Trigonometry · Trigonometry

Problem

If xx lies in the interval (π, 3π/2)(\pi,\,3\pi/2) and sin⁡x=−45\sin x=-\dfrac{4}{5}, what is the sign of cos⁡x\cos x? (a) Positive (b) Negative (c) Zero (d) Depends on the value of xx

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