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[" 2.If the angles of triangle "ABC" be ...

[" 2.If the angles of triangle "ABC" be in "A.P" ,then "],[[" (a) "c^(2)=a^(2)+b^(2)-ab," (b) "b^(2)=a^(2)+c^(2)-ac],[" (c) "a^(2)=b^(2)+c^(2)-ac," (d) "b^(2)=a^(2)+c^(2)]]

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