Asked by Johnathan
Use the half angle formula to find
cos(pi/12)
cos(pi/12)
Answers
Answered by
Reiny
Hint #1 : pi/12 = 1/2 of pi/6, and you should be familiar with the trig ratios of pi/6 or 30º
Hint #2 : cos 2A = 2cos^2 A - 1
Hint #2 : cos 2A = 2cos^2 A - 1
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