SOLUTION: Is it possible to find x here where both a and b are known? a = cos(x - b) I have looked through all the identities on Wikipedia but just keep going round in circles. :( If t

Question 336320: Is it possible to find x here where both a and b are known?
a = cos(x - b)
I have looked through all the identities on Wikipedia but just keep going round in circles. :( If this doesn't appear to be possible, I will explain the context behind it but I'll just keep the question short and simple for now. Thanks.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Simply take the arccosine of both sides to get . Notice how . So this is why the "plus/minus" is there.

Then add b to both sides and rearrange terms to get
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