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March 3, 2015

March 3, 2015

Posted by **kally** on Saturday, February 11, 2012 at 8:52pm.

u, v, w are UNIT VECTORS. the angle between u and v is 25 degrees and the angle between vector v and w is 35 degrees.

find (u+w-3v). NOTE: vector u and w are on opposite sides of vector v.

- Calculus -
**Damon**, Saturday, February 11, 2012 at 9:54pmI guess I am to assume that all three are in the same plane.

Arbitrarily take v to be in the x direction so is unit vector i

then

u = cos 25 i + sin 25 j

v = 1 i

w = cos 35 i - sin 35 j

then

u+w-3v = (cos 25+cos35-3)i +(sin 25-sin 35) j

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