SOLUTION: Solve the equation for the interval [0,2π) cosē(x)+2cos(x)+1 = 0 The answer I know that is: π , but how to you do it?

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Question 978446: Solve the equation for the interval [0,2π)
cosē(x)+2cos(x)+1 = 0
The answer I know that is: π , but how to you do it?
Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!



Use u-substitution:

Let u = cos(x)







u+1 = 0
  u = -1

Substitute cos(x) for u

cos(x) = -1

     x = p

Edwin
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