Prove that the equation to the circle of...

Prove that the equation to the circle of which the point ` (x_(1), y_(1)) and ( x_(2) , y_(2))` are the ends of a chord of a segment containing an angle ` theta ` is
`( x - x_(1)) ( x - x_(2)) + ( y- y_(1)) ( y - y _(2)) pm cot theta [ ( x - x_(1)) ( y - y_(2)) - ( x - x _(2)) ( y - y _(2)) ] = 0`

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