SOLUTION: value of sin(a/2) if cos a=2/3 and (0<a<90)

Question 778053: value of sin(a/2) if cos a=2/3 and (0
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
value of sin(a/2) if cos a=2/3 and 0 < a < 90�
use half-angle formula for sin:

..
check:
cos(a)=2/3
a≈48.19�
a/2≈24.09�
sin(a/2)≈sin(24.09�)≈0.4082
exact value=√6/6≈0.4082
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