Question

Any other method instead of

$\sqrt{ {a}^{2 } + {b}^{2} + 2abcos \alpha }$

​

Answer 1

Answer:

Go through derivation but it becomes hard?.....

Answer 2

Answer:

b

5N

when two equal vector at 120° then Resultant is individual

At 90°

5√2

At 60°

5√3

At 0°

10

At 180°

0

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