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I need help with these as well

I need help with these as well-example-1
User Tibidabo
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a. \: {f}^( - 1) (x) = (7(x - 12))/(2) \\ b. \: {f}^( - 1) (x) = {( (x - 6)/(9) )}^(2) + 27 \\ c. \: {f}^( - 1) (x) = \sqrt{ (x + 78)/(35) } \: or \: {f}^( - 1) (x) = - \sqrt{ (x + 78)/(35) }

User Nil Pun
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