pre-calc-is this the right way????

Posted by Jacquie on October 21, 2002 at 18:17:29:

find exact value of cos 11pi/12
i used the double-angle formula for cos
sq. root of (1 + cos 11pi/12)/2
sq. root of(1+cos(8pi/12 + 3pi/12))/2
sq. root of(1+cos(2pi/3 + pi/4))/2
sq. root of(1+(-1/2)+ (sq.root of2/2))/2
sq. root of(2/2+sq. root of2-1/2/2
sq.root of(sq. root of 2 +1/2)/2
but i dont know how to further reduce this???

Follow Ups:

• Re: pre-calc-is this the right way???? T.Gracken 19:03:46 10/23/02 (0)
• Re: pre-calc-is this the right way???? Jonathan Burros 16:31:52 10/23/02 (0)
• Re: pre-calc-is this the right way???? Jack 20:02:52 10/21/02 (0)

Post a Followup