<span>First of all in order to find the exact value by using a half angle identity we will do cos(5π divided by 12)
=cos (5π divided by 6) divided by 2 = ± Under root[(1+cos (5π divided by 6) divided by 2] Now we will consider + sign because 5π divided by 12 is in quadrant. where cos>0 so the solution is [(1- Under root 3 divided by 2) divided by 2] We will ignore the negative sign I hope it helped.</span>
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