Calculate:
\(\[ \arccos \sqrt{\cfrac{1+\sqrt{\cfrac{1-\sqrt{\cfrac{1-\sqrt{\cfrac{1+\cfrac{\sqrt{3}}{2}}{2}}}{2}}}{2}}}{2}}.\]\)
The output of an inverse trig function should be in radians.
The answer is 2/15*pi.
See https://web2.0calc.com/questions/pre-calc-problem#r5
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