- Thread starter
- #1

#### veronica1999

##### Member

- Jun 4, 2012

- 63

1) I can draw a unit circle and easily see that the angle is 35.

2) Change the values to decimals and use the law of cosines.

(Tried this but the calculation was a bit messy)

or use cos(theta) = uv/ lullvl

3) Use dot product and get the equation for

cos(54-19) = cos54cos19 + sin54sin19

Did my answers get the point of the problem?