81. Consider the function f(x) = x cos 2r. (a) Find the signed area between the graph of f(x) and the x-axis on [0, 31/4] shown in the figure next at the left. (b) Find the area between the graph of f(x) and the graph of g(x) = - cos 2x on [0, 37 /4] shown in the figure next at the right. 2.0- 2.0- 1.5+ 1.5 1.0+ 1.0- 0.5+ 0.5+ -0.5+ -0.5+ 4 4 -1.0+ -1.5+ -2.0 -1.0 -1.5+ -2.0

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