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January 29, 2015

January 29, 2015

Posted by **bhawani** on Wednesday, January 2, 2013 at 1:04am.

- math -
**Steve**, Wednesday, January 2, 2013 at 4:58amwe know that

(p+2q)•(5p-4q) = 0

5p•p + 10p•q - 4p•q - 8q•q = 0

since p and q are unit vectors, we have

5 + 6p•q - 8 = 0

p•q = 1/2

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