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In the figure two circles are miutually ...

In the figure two circles are miutually passing through 'A' and 'B '. 'C D' is the common tangent to both circles.
Prove that '/_ C A D+/_ C B D=180^circ'.
'(##VPU_TTT_MAT_X_P02_C07_E07_002_Q01##)'

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