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Andrewlorenzo
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Homework Statement
Two vectors of lengths a and b make an angle θ with each other when placed tail to tail. Prove, by taking components along two perpendicular axes, that the length of the resultant vector is r=√(a^2+b^2+2abcos θ )
Homework Equations
Would this be correct?
How would you simplify it?:uhh:
The Attempt at a Solution
So ax = acos θ , bx = bcos θ , ay = asin θ , by = bsin θ. So rx = ax + bx and ry = ay + by . So r=√(r_x+r_y ) .
Which means that, √(〖[(a+b)cosθ]〗^2+〖[(a+b)sinθ]〗^2 )