- #1
veronica1999
- 61
- 0
Show that there are at least two ways to calculate the angle formed by the vectors [cos 19, sin 19] and [cos 54, sin 54].
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?
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?