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July 7, 2015

July 7, 2015

Posted by **deepak** on Tuesday, May 24, 2011 at 4:51am.

- mathematics -
**MathMate**, Tuesday, May 24, 2011 at 7:54amsin(a)=0.5

use sin²(a)+cos²(a)=1

0.5²+cos²(a) = 1

cos²(a)=3/4

cos(a)=sqrt(3)/2

cos³(a)=(3/8)sqrt(3)