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![[Post New]](/templates/default/images/icon_minipost_new.gif) 1 May 2008 10:40:27 IST
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equationn of pair of the tangents from ( p . q ) to the circle
T^2 = S S1
now angle between these lines is given by
tan theta = 2 rt ( h^2 - a b ) / a + b
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