A=20 B=30 the angle between them is 60 then the resultent is
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√20²+30²+2*20*30*cos60°
√400+900+1200*1/2
√400+900+600
=√1900
=10√19
√400+900+1200*1/2
√400+900+600
=√1900
=10√19
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