How do you find the exact value of $cos(pi/6)$ ?

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Answer 1 · 2017-03-16T12:43:10

I tried a "geometrical" approach:

Have a look:
enter image source here

Answer 2 · 2017-03-16T12:59:30

$0.866025403$

$cos(pi/6)$ Radians

$cancelpi^color(red)1/cancel6 xx cancel180^color(red)30/cancelpi^color(red)1$ degrees

$:.cos30°$

$:.cos30°=0.866025403$

How do you find the exact value of cos(pi/6)cos(pi/6)?