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[" 50.If "f(x)={[(1)/(2x^(2)-7x+5)," for...

[" 50.If "f(x)={[(1)/(2x^(2)-7x+5)," for "x!=1],[-(1)/(3)," for "x=1]," then "f'(1)=],[[" (a) "-1/0," (b) "-2/0],[" (c) "-1/3," (c) "1/3]]

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