Prove that the straight line y = m.x wi...

Prove that the straight line y = m.x will touch the circle
` x^(2) + 2xy cos omega + y^(2) + 2gx + 2 fy + c = 0 `
if ` ( g + fm) ^(2) = c ( 1 + 2m cos omega + m^(2))`

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