A rain gutter is to be constructed from a metal sheet of width 54 cm by bending up one-third of the sheet on each side through an angle 8. 18 ст 18 ст 18 ст (a) Show that the cross-sectional area of the gutter is modeled by the function A(6) = 324 sin(e) + 324 sin(6) cos(8).

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