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find the locus of the middle points of chord of circle x^2+y^2=a^2 which pass through fixed point (h,k)
circle passing through origin and center lying on the x-axis is x^2+y^2......M is mid point of the AB.
Let (x1, y1) be the middle point of chord of circle x2+y2=a2Then equation of chord can be written as xx1+yy1=x12+y12Since chord passes through (h,k) we havehx1+ky1=x12+y12Now replace x1 by x and y1 by y to get the locus of middle points asx2+y2 = hx+ky
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