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3-1.Vectors
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Two vectors having equal magnitudes $A$ make an angle $\theta$ with each other. The magnitude and direction of the resultant are respectively
A$2\,A \cos \frac{\theta}{2}$, along bisector
B$A \cos \frac{\theta}{2}$, at $45^{\circ}$ from one vector
C$2\,A \sin \frac{\theta}{2}$, along bisector
D$A \cos \frac{\theta}{2}$, along bisector
Solution

Resultant will be $2 A \cos \frac{\theta}{2}$ along bisector.
Standard 11
Physics