Question 1015676
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2. Find the exact real value of arccos the quantity one half.
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You need to find the angle {{{alpha}}} = {{{arccos(1/2)}}}.

So, {{{cos(alpha)}}} = {{{1/2}}}.


What angle is this?


Surely, {{{alpha}}} = {{{pi/3}}} = 60 degrees.


Hence, {{{arccos(1/2)}}} = {{{pi/3}}} = 60 degrees.