Asked by Anonymous

Solve this multiple-angle equation.

cos x/2 = -(sqrt3)/2
Answered by Steve
well, you know that cos π/6 = √3/2
So, with the negative value, you have

x/2 = 5π/6 or 7π/6
Answered by Anonymous
So the solutions are also 5π/6 + 2npi and 7π/6 2npi, right?
Answered by Steve
nope. cos(x/2) has period 4π
Answered by Steve
also, note that x/2 = 5π/6. So, x = 5π/3.
Watch the details, guy.
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