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Posted by on Thursday, May 1, 2008 at 4:18pm.

Use the half angle formula to find

cos(pi/12)

  • trig - , Thursday, May 1, 2008 at 4:22pm

    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

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