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[" 42The incentre of the triangle formed...

[" 42The incentre of the triangle formed by the lines "],[x cos alpha+y sin alpha=pi,quad x cos beta+y sin beta=pi],[x cos gamma+y sin gamma=pi" is "(h,k)" then "h+k=],[[" 4) "0," 2) "1," 3) "2," 4) "4]]

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