Let f be the function given by f(x) = 4 cos x. As shown below, the graph of f crosses the y-axis at point P (0, 4) and the x-axis at point Q (,0). Find the x-coordinate of the point on the graph of f, between points P and Q, at which the line tangent to the graph of fis parallel to line PQ. -TT/4 -2- 0 -2- P K TT/4 TT/2 3TT/4

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