Question: Within the interval (-0.8,1.81), for what value of x does f(x) take on a minimum if f(x)=2.6 sin (2.4x)-7 cos (2.4x)

Within the interval (-0.8,1.81), for what value of x does f(x) take on a minimum if f(x)=2.6 sin (2.4x)-7 cos (2.4x)

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