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We have 2 vectors: AC, BD. Then |AC| = a and |BD|=b (i want to make it easier)

and sum i'll call s , where s = AC + BD (we're adding vectors)

there is an equation:

s2 = a2 + b2 - 2ab cos x , where x is an angle between vectors a and b.

The sum has a maximum value when x = 0

and the minimum value when x=180*=pi (rad)

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Q: What are the conditions for maximum and minimum sum or resultant of two vectors?
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