Trig: Use a half angle formula to find the exact value of the expression? cos(5pi/12)

asked Aug 18, 2019 26.5k views

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Trig: Use a half angle formula to find the exact value of the expression?

cos(5pi/12)

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I believe that the correct answer would be 0.999739299
5 * 3.14 = 15.7
15.7/12 = 1.308333333
cos(1.308333333)
0.999739299

Ben Reser answered Aug 23, 2019

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