document.write( "Question 289125: find a dot b for a = <1,3> and magnitude b =5 and the angle between these vectors is 120 degrees. \n" ); document.write( "

Algebra.Com's Answer #209487 by jim_thompson5910(35256) $\"\"$ $\"About$

You can put this solution on YOUR website!
Hint: Recall that the angle between two vectors

and

, let's call it

, can be represented in the equation:\r
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where

is the magnitude of

and

is the magnitude of

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