Use the information given about the angle ?, cot ? = -3, sec ? < 0, 0 ? ? < 2?, to find the exact values of the following. (a) sin (2?), (b) cos (2?), (c) sin ?/2, and (d) cos ?/2 (a) sin (2?) = (Type an exact answer, using radicals as needed.)
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Using the Pythagorean theorem, we find the hypotenuse to be $\sqrt{10}$. Show more…
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