(a) Calculate the differential df of the function f = tan(x). Use it to find an = π/4, approximation for the change of f in the vicinity of x i.e. ▲ƒ = f(x) − f(7/4), in the form of differential df at x = π/4. (b) Use this differential to approximate tan(π/3) given that = П +聶 .

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