If the line segment joining the points \[A(a,b)\] and \[B(c,d)\] subtends an angle \[\theta \] at the origin, then \[\cos \theta =\]

\[\frac{ab+cd}{\sqrt{({{a}^{2}}+{{b}^{2}})({{c}^{2}}+{{d}^{2}})}}\]

\[\frac{ac+bd}{\sqrt{({{a}^{2}}+{{b}^{2}})({{c}^{2}}+{{d}^{2}})}}\]

\[\frac{ad+bc}{\sqrt{({{a}^{2}}+{{b}^{2}})({{c}^{2}}+{{d}^{2}})}}\]

If the line segment joining the points \[A(a,b)\] and \[B(c,d)\] subte

1.	If the line segment joining the points \[A(a,b)\] and \[B(c,d)\] subtends an angle \[\theta \] at the origin, then \[\cos \theta =\]
A.	\[\frac{ac+bd}{\sqrt{({{a}^{2}}+{{b}^{2}})({{c}^{2}}+{{d}^{2}})}}\]
B.	\[\frac{ab+cd}{\sqrt{({{a}^{2}}+{{b}^{2}})({{c}^{2}}+{{d}^{2}})}}\]
C.	\[\frac{ad+bc}{\sqrt{({{a}^{2}}+{{b}^{2}})({{c}^{2}}+{{d}^{2}})}}\]
D.	None of these
Answer» B. \[\frac{ab+cd}{\sqrt{({{a}^{2}}+{{b}^{2}})({{c}^{2}}+{{d}^{2}})}}\]

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If the line segment joining the points \[A(a,b)\] and \[B(c,d)\] subtends an angle \[\theta \] at the origin, then \[\cos \theta =\]

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