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Triangle law of vectors or parallelogram law of vectors. Just while subtracting change the direction of the vector which is to be subtracted and add along with the one from which it is to be subtracted. Just as we change the sign and add in case of subtraction of numbers.
Answer2:
Vectors are added and subtracted by component.
A=a1 + a2 and B=b1 + b2
then C = A + B = (a1 + b1) + (a2 + b2) = c1 + c2 .
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