how to ADD VECTORS with NUMERICALS ON THEIR LEFT SIDE, can anyone explain ME PLZ??!

Let there are two vectors A and B and the angle between them is θ.Suppose now we need to add  xA and yB. The angle between them is still θ.
The resultant,
R=x2A2+y2B2+2xyABcosθ
and the angle between the resultant and A is given by,
ϕ=tan-1yBsinθxA+yBcosθ

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