Use trigonometric identities to find the value of each expression.

- The quadrant is critical to find the value of trig expressions.

1st. Need to check in what quadrant you are in and what is the sign of your identity in that quadrant. Then pick the right trig identity. You can't use the right triangle because you are asked to find the trig identity.

**Rationalize was both the numerator and denominator by the square root of 5**

[phantomboss]

Thanks for this video, I have my pre-calc final tomorrow and this helps a lot