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The orthocentre of the triangle whose sides are x + y = 9, 2x - y = 9 and
2y - x = 9 is:
1. (-5, 5)
2. (5, -5)
3. (5, 5)
4. (-5, -5)

The incentre of the triangle formed by the lines 5x - 12y = 0, 3x + 4y = 0 ...

The circle drawn on any focal chord of a parabola as diameter touches: ...

The curve x = 3 (cos t + sin t) and y = 4 (cos t - sin t) is:
1. a ...

The point on the line 2x - 3y = 5 which is equidistant from (1, 2) and (3, ...

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