How do you solve $cos θ = 1/2$ ?

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Answer 1 · 2016-12-02T18:21:00

The two minimum values of angle, $theta$ are $60°$ & $300°$ .

Given that, $costheta=1/2$ .
But, it is known that, $cos60°=1/2$ .

Also, $cos300°=1/2$ .

$:.theta=60°$ & $theta=300°$ .
So, $theta$ has lots of values for which their cosine function is $1/2$ .

But, the two least values of $theta$ are $60°$ & $300°$ .

How do you solve cos θ = 1/2 cos θ = 1/2 ?