When is the magnitude of resultant of two vectors equal to either of them. (MIP)

Resultant of two vectors,R=A2+B2+2ABcosθFirst condition is,A=BR=A2+A2+2A2cosθIn this case,θ=1200R=A2+A2+2A2×cos 1200R=2A2+2A2×(-12)=AThus, the two conditions are:Two vectors are equal i.e. A=BAnd the angle between them, θ=1200

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