SOLUTION: Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number.
sin(4π/7) cos(5π/21) − cos(4π/7) sin(5π/21)
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Question 1162185: Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number.
sin(4π/7) cos(5π/21) − cos(4π/7) sin(5π/21)
Answer by greenestamps(13203) (Show Source): You can put this solution on YOUR website!
Plug in the numbers:
You can finish....
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