At what angle two unit vectors should be inclined so that their resultant is also a unit vector ?

120 degrees
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But how
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Vector a =1 vector b= 1 Vector R = 1 then R^2 = a^2 + b^2 + 2 a b cos theta Thus 1 = 1 +1 + 2.1.1.cos.theta 2cos theta = -1 Cos theta = -1/2 Theta = 120 degree
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Let vectors A and B inclined at an angle P. The resultant is given by A+B and we know that magnitude of resultant is 1. So, (A+B)= A²+B²+2AB cos P 1 =1 + 1 + 2 cos P By solving further we get : P= 120. Therefore angle / theta = 120.
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