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O' is the centre of the circle and 'AB' ...

O' is the centre of the circle and 'AB' is a chord. 'A C' is the bisector of '/_ O A B'. '/_ OAB=56^circ'
a) Prove that 'O C' and 'A B' are parallel.
b) Find '/_ A B C' and '/_ O B E'.
'(##VPU_TTT_MAT_X_P01_C02_E06_001_Q01##)'

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