[" 27.In "Delta ABC" ,if "r(1)=2r(2)=3r(...

[" 27.In "Delta ABC" ,if "r_(1)=2r_(2)=3r_(3)" and "D" is the mid "],[" point of "BC" then "cos/_ADC=],[[" 1) "7/25," 2) "24/25," 3) "-7/25" 4) "-24/25]]

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