Use the figure to find the exact value of the trigonometric function cos 20 A. -

Question

Use the figure to find the exact value of the trigonometric function cos 20 A. -41/841 B. 41/841 C. 840/841 D. 39/841 Use the given information to find the exact value of the trigonometric function cos 0/2. sin theta = 5 Squareroot 29/29 B. - 2 Squareroot 29/29 c. 21/58 D. 5 Squareroot 29/29 Find all solutions of the equation. 8 sin x + 6 Squareroot 2 = 6 sin x + 5 Squareroot 2 A. x = pi/4 + 2 n pi or x = 7 pi/4 + 2 n pi B. x = 5 pi/4 + 2 n pi or x = 7 pi/4 + 2 n pi c. x = pi/4 + n pi or x = 3 pi/4 + n pi D. x = 5 pi/4 + n pi or x = 7 pi/4 + n pi

Explanation / Answer

15. Cos 2 theta=2cos2theta-1

Cos theta=adjacent/hypotenuse=21/29

Cos 2theta=2(21/29)2-1=41/841

Correct option is B

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