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PQR is a triangle PT is a bisector of angle P
QR is extended to S
R.T.P - angle PQR + angle PRS = 2 * angle
PTR 4QPT=4RPT [PT is a bisector of angle P]
PTR =xPQR + 4QPT
4PQR = 4 PTR - 4QPT..
4 PRS=4 PTR + RPT..
ADDING [1] AND [2]
4PQR+ PQR 4 PTR - 4QPT + 4 PTR + 4 RPT
4PQR+ & PQR = 4 PTR - 4 QPT + 4 QPT +
4PTR
[4QPT = 4RPT]
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