81. A wire filament is shaped to match the graph of the func- tion of y = In(2 cos x) from x = - to x = 5, measured 3 in inches, as shown in the figure. Given that the length of a curve y = f(x) from x = a to x = b can be calculated with the formula /1+ (f'(x))² dx, find the length of the filament. Shape of wire filament 0.75 0.50 0.25 +x -프 3 프 프 3 6

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