tan 43 /2 cot 47 + 2 sec 13/cosec 77 -2 sin 90 /cos 0
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if bisector AE of exterior vertical angle DAE of triangle abc be parallel to base BC prove that tringe is isoscelesif bisector AE of exterior vertical angle DAE of triangle abc be parallel to base BC prove that tringe is isoscelesif bisector AE of exterior vertical angle DAE of triangle abc be parallel to base BC prove that tringe is isoscelesif bisector AE of exterior vertical angle DAE of triangle abc be parallel to base BC prove that tringe is isoscelesif bisector AE of exterior vertical angle DAE of triangle abc be parallel to base BC prove that tringe is isoscelesif bisector AE of exterior vertical angle DAE of triangle abc be parallel to base BC prove that tringe is isoscelesif bisector AE of exterior vertical angle DAE of triangle abc be parallel to base BC prove that tringe is isoscelesif bisector AE of exterior vertical angle DAE of triangle abc be parallel to base BC prove that tringe is isoscelesif bisector AE of exterior vertical angle DAE of triangle abc be parallel to base BC prove that tringe is isoscelesif bisector AE of exterior vertical angle DAE of triangle abc be parallel to base BC prove that tringe is isosceles