Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of sum and difference of two and three angles
MediumIf $\sin (A+B) \sin (A-B)+\cos (A+B) \cos (A-B)=\frac{1}{2}$ and $0 < B < \frac{\pi}{2}$,then $B=$
- A$\frac{\pi}{6}$
- B$\frac{\pi}{4}$
- C$\frac{\pi}{3}$
- D$\frac{5 \pi}{12}$
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