The phase difference between two $SHM\,\,$  ${y_1}\, = \,10\,\sin \,\left( {10\pi t\, + \,\frac{\pi }{3}} \right)$ and ${y_2}\, = \,12\,\sin \,\left( {8\pi t\, + \,\frac{\pi }{4}} \right)$  at $t = 0.5\,s$ it
  • A$\frac {11 \pi}{12}$
  • B$\frac {13 \pi}{12}$
  • C$\pi $
  • D$\frac {17 \pi}{12}$
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