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[" In figure,"I" and "m" are two paralle...

[" In figure,"I" and "m" are two parallel tangents to a "],[" circle with centre "O" ,touching the circle at "A" and "],[B" respectively.Another tangent at "C" intersects "],[" the line "I" at "D" and "m" at "E" Prove that "],[/_DOE=90^(@)],[qquad [" of ",=],[,=]],[,=],[,=]

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