How do you find the exact value of $cos^-1(1/2)$ ?

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Answer 1 · 2016-08-21T19:05:16

60 degrees

$cos^-1$ (1/2)
means the angle whose cosine is $1/2$

Draw an equilateral triangle , cut it in half,: the ratio of the sides

is 1:2: $sqrt3$

The angle whose cosine is $1/2$ is 60 degrees.

How do you find the exact value of cos^-1(1/2)cos^-1(1/2)?