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If the side BC of AABC is produced to D, the bisector of ZACD is known as the external bisector of angle C. The

If the side BC of AABC is produced to D, the bisector of ZACD is known as the external bisector of angle C. The internal bisector of B and the external bisector of ZC meet at P. Prove that 2 x ZBPC ZBAC.

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