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  1. Express

    f(x)=sin⁡(x)−3cos⁡(x)

    in the form

    Asin⁡(x−kπ)

    where k∈Q such that 0<k<1.

  2. Sketch the curve y=f(x).

  3. Find the maximum value of f(x) and the smallest positive value of x for which this occurs.