Posted by marley on Friday, June 10, 2011 at 1:27am.
cosine theta = (a*i)/|a|
|a| is the magnitude of the a vector,
which is sqrt13 = 3.6056
a*1 is the dot product of a and the i vector, which is 2.
Therefore cos theta = 2/3.6056 = 0.5547
theta = 56.3 degrees
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