Two vectors A and B are …
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Sia ? 6 years, 7 months ago
R=A=B=x
R2=A2+B2+ABcos{tex}\theta{/tex}
X2=x2+x2+x.xcos {tex}\theta{/tex}
X2=2x2+x2 cos {tex}\theta{/tex}
X2-2x2=x2cos {tex}\theta{/tex}
-x2=x2cos {tex}\theta{/tex}
-x2/x2=cos {tex}\theta{/tex}
-1/2=cos {tex}\theta{/tex}
(cos {tex}\theta{/tex}) =cos 60
{tex}\theta{/tex} = 60
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