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Solve for x: 4cos6x-sin6x=cos^3x+3cos2x

Solve for x:
4cos6x-sin6x=cos^3x+3cos2x

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1 Answers

Sher Mohammad IIT Delhi
askIITians Faculty 174 Points
9 years ago
4cos6x-sin6x=cos^3x+3cos2x

for x=0,.
4-0=1+3
means x=0 is a solution

for x=pi
4- 0= -1 +3 , not a solution.

hence only 2npi , is solution of the equation where n=1,2,3..............

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