SOLUTION: Use double or half angle formula to determine the value of the trigonometric function sin(5pi/12) Do you know how to solve this?

Algebra ->  Trigonometry-basics -> SOLUTION: Use double or half angle formula to determine the value of the trigonometric function sin(5pi/12) Do you know how to solve this?      Log On


   

Question 1191433: Use double or half angle formula to determine the value of the trigonometric function sin(5pi/12)
Do you know how to solve this?
Answer by ikleyn(52793) About Me  (Show Source):
You can put this solution on YOUR website!
.

%285pi%29%2F12 = 5%2A%28180%2F12%29 degrees = = 5*15 degrees = 75 degrees.

sin%2875%5Eo%29 is found in the lesson
    - Calculating trigonometric functions of angles

in this site.

It uses the formula 75° = 45° + 30° and the formula of adding arguments for sine.