On a unit circle, the terminal point of is (1/2, (sqrt(3))/2) What is cos ?

Question

asked Oct 25, 2023 212k views

1 Answer

Qloq · Answer 1 · 2023-10-28T23:22:26+0000

Reason:

The x coordinate of the point on the unit circle corresponds to
$\cos(\theta)$

The formulas to write down and memorize are

$\text{x} = \cos(\theta)\\\\\text{y} = \sin(\theta)$

where the angle theta (symbol
$\theta$ ) is measured starting at the positive x axis, and you move counterclockwise.

Side note: Trigonometry is useful for things like navigation.