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4 sin x cos^3 x+4 sin^3 x cos x? If f(x)=ln(x)+arctan(x), find the derivative of f^(-1)(2) (inverse of f(x))? What is the metric to use to determine if a person is lying or telling the truth? In triangle ABC,prove that tanA+tanB+tanC=tanAtanBtanC? Find the points (x,y) on the graph y=x^2 that are closest to the point (0,2)?