if a is equal to 2 b is equal to 4 and theta is equal to 60 degree the magnitude of resultant will be
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magnitude of(a+b) =root(a^2 +b^2 +2ab costheta)
=root(2^2 +4^2 +2×2×4 cos60)
root(4+16 +16cos60)
root(20 +16(1/2))
root(20 +8)
root(28)
root(4×7)
2root7 is answer obtained
=root(2^2 +4^2 +2×2×4 cos60)
root(4+16 +16cos60)
root(20 +16(1/2))
root(20 +8)
root(28)
root(4×7)
2root7 is answer obtained
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