Vector sum of
A
and
B is maximum, if the angle between them is xx
150
Find value of x’.​

1 thought on “Vector sum of<br />A<br />and<br />B is maximum, if the angle between them is xx<br />150<br />Find value of x’.​”

1. Answer:

   The angle α which the resultant R makes with A is given by

   tanα=A+BcosθBsinθ

   or cos(θ/2)sin(θ/2)=A+Bcosθ2Bsin(θ/2)cos(θ/2)

   which gives A+Bcosθ=2Bcos2(2θ)

   or A+B[2cos2(2θ)−1]=2Bcos2(2θ)

   A=B

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