(Solved): Using the sum and difference of cosines formula, find the exact value of \( \cos \left(\frac{\pi}{ ...

Using the sum and difference of cosines formula, find the exact value of \( \cos \left(\frac{\pi}{12}\right) \). Enclose numerators and denominators in parentheses. For example, \( (a-b) /(1+n) \). \[ \cos \left(\frac{\pi}{12}\right)= \] ?? Show your work and explain, in your own words, how you arrived at your answer.