1 Answer

Danu · Answer 1 · 2019-07-25T21:19:07+0000

Sin angle that equals the 1/2 value is the 30 degree on the 1st Quadrant.

The angle of 30 degree on the 3rd Quadrant is equivalent to (formula and circle in the 1st photo) 180 + 30 = 210°.

So theta = 210° (3rd Quadrant) = 30° (1st Quadrant).

$cos \: 30\degree = √(3) / 2$

Now just transfer the cos 30° to the 3rd Quadrant and the signal will be negative (as shown in the 2nd photo attached).

$cos \: 210 \degree = - √(3) / 2$

If sin theta = -1/2 and lies in the third quadrant, what is the cos?-example-1

If sin theta = -1/2 and lies in the third quadrant, what is the cos?-example-2

0 Comments

Please log in or register to add a comment.

Please log in or register to answer this question.

1 Answer

0 Comments

Please log in or register to add a comment.

Other Questions