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(a) Find the magnitude of the moment about $O$ by evaluating $?OA×F??(0???180_{?})$ Use a graphing utility to graph the resulting function of $?$. (b)..use.the.result of part (a) to determine the magnitude of the moment when $?=45_{?}$. (Round your answer to two decimal places.) $i_{2}$ (c) Use the result of part (a) to determine the angle $?$ when the magnitude of the moment is maximum.