Asked by kc
solve the equation 4cos^2x-1=0
Answers
Answered by
Henry
4c0s^2x - 1 = 0.
4cos^2x = 1,
Divide both sids by 4:
cos^2x = 0.25,
Take sqrt of both sides:
cosx = 0.5,
X = 60 deg.
4cos^2x = 1,
Divide both sids by 4:
cos^2x = 0.25,
Take sqrt of both sides:
cosx = 0.5,
X = 60 deg.
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