SOLUTION: sin(13pi/12) cos(13pi/12)

Algebra ->  Trigonometry-basics -> SOLUTION: sin(13pi/12) cos(13pi/12)      Log On


   

Question 1198300: sin(13pi/12) cos(13pi/12)
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
sin(13pi/12) cos(13pi/12) = 0.25

Answer by ikleyn(52864) About Me  (Show Source):
You can put this solution on YOUR website!
.

    sin%2813pi%2F12%29%2Acos%2813pi%2F12%29 = use the standard trigonometry identity = 

  = %281%2F2%29%2Asin%282%2A%2813pi%2F12%29%29 = %281%2F2%29%2Asin%2826pi%2F12%29 = %281%2F2%29%2Asin%282pi%2F12%29 = %281%2F2%29%2Asin%28pi%2F6%29 = %281%2F2%29%2A%281%2F2%29 = 1%2F4 = 0.25.    ANSWER

Solved, with full details.