find all the solutions for cos x = -1/8

Question

find all the solutions for cos x = -1/8

Answer 1

First, find one solution using arccos (inverse cosine) function on calculator. I suggest that you use degree measure.

Obviously that one answer is in the second quadrant.  There's another angle in the third quadrant, too--can you find it?

 

For each of your two answers, you may add ANY INTEGER MULTIPLE OF 360^o