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If the join of (x1,y1) and (x2,y2) makes...

If the join of `(x_1,y_1)` and `(x_2,y_2)` makes on obtuse angle at `(x_3,y_3),` then prove that `(x_3-x_1)(x_3-x_2)+(y_3-y_1)(y_3-y_2)<0`

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CENGAGE PUBLICATION-CONIC SECTIONS-All Questions
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