Question

What is the general value of cos x = -1/2 ?​

Answer 1

Answer:

Thus, the basic solution of the equation cos x = a, -1 < a < 1 is the value of inverse cosine function, x0 = arccos a or x0 = cos-1 a, that is, an arc or angle (whose cosine equals a) between 0 and p which is called the principal value.

Answer 2

Answer:

I think this is what you are asking for..

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