Question

Given cos 0=-4/5, and the angle 0 is in quadrant two, find the value for sin 0.

Answer 1

You can use Pythagorean identity w/ sine and cosine to find \(\sin\theta\) given \(\cos\theta\) then use the fact that \(\theta\) is in Quadrant 2.

Answer 2

the 3 via pythagoras or more likely just remembering the famous 3 - 4 - 5 right triangle
then sine is opposite over hypotenuse, and it is positive since you are in quadrant 2

Answer 3

thanks

Answer 4

yw