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Answer to Question #25416 in Trigonometry for Melissa

Question #25416
4cos(x)=-1+cos(x)
Expert's answer
4cos(x)=-1+cos(x)At first let's gather cosines at the left part of the equation:

3cos(x)=-1
cos(x)=-1/3According to the general formulas for solutions of elementary trigonometric equations we obtain the following answer:

x=2pi*n+-cos^-1(-1/3)

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