given two unit vectors a and b and angle between them is 90° find the magnitude of resultant vector and and their unit vector in the direction of the resultant vector
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This is a kind of fact. When you solve questions up ahead. You simply use the value √2 for two unit vectors at 90°. Just to save your time we avoid going through calculations everytime.
Similarly Magnitude of 3 unit vectors is √3 (√(i)² +(j)²+ (k)²). However the angle between them in such a case can be calculated be Direction Cosines
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