SOLUTION: cos(4𝑥) − 3 sin (3𝜋/2+ 2𝑥) + 2 = 0 Find the general solutions (in radians)

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Question 1204390: cos(4𝑥) − 3 sin (3𝜋/2+ 2𝑥) + 2 = 0
Find the general solutions (in radians)
Found 2 solutions by MathLover1, Edwin McCravy:
Answer by MathLover1(20850)   (Show Source): You can put this solution on YOUR website!


using trigonometric identities to simplify




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solutions:
if => , element
if => , element , and , element
combine solutions:





Answer by Edwin McCravy(20065)   (Show Source): You can put this solution on YOUR website!












2cos(2x)+1 = 0;  cos(2x) + 1 = 0
  2cos(2x) = -1;     cos(2x) = -1
   cos(2x) = -1/2


 




 


Edwin
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