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If |f(x1)-f(x2)|lt=(x1-x2)^2, for all x...

If `|f(x_1)-f(x_2)|lt=(x_1-x_2)^2,` for all `x_1, x_2 in R ,` then the equation of tangent to the curve `y=f(x)` at the point `(1,2)` is a.`y=2` b. `y=3` c. `x=2` d. `x=3`

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