Asked by Kelly

Finding all Solutions for
2cos(x)-ã3=0
Answered by bobpursley
Is this cosx=1/2sqrt3 ?

Answered by Kelly
no it's 2cosx-sqrt3=0
Answered by Reiny
I will read it as
2cosx - √3 = 0
cosx = √3/2
x = 30° , from the standard 30-60-90 triangle

or x = 330°

"all solutions " would be
x = 30 + k(360) or x = 330+k(360)° where k is an integer.
Answered by Kelly
How do you find the solutions?
Answered by Reiny
since the standard cosine curve has a period of 360°, any answer you have will repeat itself in the next curve or 360° either to the right or to the left.
by multiplying 360 by k, k and integer, I am simply adding/or subtracting multiples of 360 to any answer.

to get my original 30°, as I said, I recognized the rations of the 30-60-90 right-angled triangle, which are 1:√3:2.
Secondly , since the cosine is positive in the 1st and 4th quadrant, the 30° will be the 1st quadrant solution and 360-30 or 330° would be the 4th quadrant solution.

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