Asked by Anonymus
What is the difference between Cos(1/2)= and arcCos(1/2)=, why are they both equal to pi/3
Answers
Answered by
Reiny
in Cos(1/2) you are asking for the cosine of the angle which is 1/2 radian
using my calculator, I got .87758....
in arcCos(1/2) , you are asking for an angle whose cosine is 1/2
in degrees that would be 60° or π/3 in radians
They are NOT the same
using my calculator, I got .87758....
in arcCos(1/2) , you are asking for an angle whose cosine is 1/2
in degrees that would be 60° or π/3 in radians
They are NOT the same
Answered by
oobleck
however, cos<sup><sup>-1</sup></sup>(1/2) is just another way to write arccos(1/2)
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