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\psset{arrowscale=2}
\pstGeonode[PosAngle=-135](-1.5,-.2){A}(.5,.2){B}(0,-2){D}
\pstRotation[PosAngle=90, RotAngle=60, CodeFig=true,
CodeFigColor=blue,
TransformLabel=\frac{\pi}{3}]{A}{B}[C]
\pstRotation[AngleCoef=.5, RotAngle=\pstAngleAOB{B}{A}{C},
CodeFigColor=red, CodeFig=true,
TransformLabel=\frac{1}{2}\widehat{BAC}]{A}{D}[E]
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