(\sin \theta-\sin \phi)^{2}+(\cos \theta-\cos \phi)^{2}=4 \sin ^{2} \f – InterviewSolution

1.	(\sin \theta-\sin \phi)^{2}+(\cos \theta-\cos \phi)^{2}=4 \sin ^{2} \frac{\theta-\phi}{2}
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