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Use the figure to find the exact value of the following trigonometric function.

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asked Mar 19, 2018 in TRIGONOMETRY by anonymous

1 Answer

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Draw the geometry diagram.

From the geometry diagram

sin(œ) =3/5

cos(œ) = 4/5

cos(2œ) = cos^2(œ) - sin^2(œ)

             =(4/5)^2 - (3/5)^2

            =(16/25)-(9/25)

            =(16-9)/25

            = 7/25

answered Mar 26, 2018 by homeworkhelp Mentor

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