AB and CD are two chords of the circle with center O, which intersects at E.Prove that: ∠AOC+∠DOB=2∠AEC

AB and CD are two chords of the circle with center O, which intersects

1.	AB and CD are two chords of the circle with center O, which intersects at E.Prove that: ∠AOC+∠DOB=2∠AEC
Answer» AB and CD are two chords of the circle with center O, which intersects at E.Prove that: $∠ A O C + ∠ D O B = 2 ∠ A E C$