SOLUTION: Evaluate a composite trigonometric expression: Find the exact value of COS(SIN raised -1 (-1/2))

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Question 914177: Evaluate a composite trigonometric expression:
Find the exact value of COS(SIN raised -1 (-1/2))
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

cos%28sin%5E-1%28-1%2F2%29%29 since sin%5E%28-1%29%28-1%2F2%29=+-pi%2F6, we have

=+cos%28+-pi%2F6+%29+
=sqrt%283%29%2F2+ .........exact result in radians