SOLUTION: 1. Use a calculator to find the approximate value of arcsin(0.72). 2. Find the exact real value of arccos the quantity one half.

Algebra ->  Trigonometry-basics -> SOLUTION: 1. Use a calculator to find the approximate value of arcsin(0.72). 2. Find the exact real value of arccos the quantity one half.      Log On


   

Question 1015676: 1. Use a calculator to find the approximate value of arcsin(0.72).
2. Find the exact real value of arccos the quantity one half.
Answer by ikleyn(52800) About Me  (Show Source):
You can put this solution on YOUR website!
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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%281%2F2%29.
So, cos%28alpha%29 = 1%2F2.

What angle is this?

Surely, alpha = pi%2F3 = 60 degrees.

Hence, arccos%281%2F2%29 = pi%2F3 = 60 degrees.