if x-1 is a factor of ax²+bx²+cx²+dx²+e show that a+c+e=b+d
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A rectangular plane surface 2m wide and 3m deep lies in water in such a way that its plane makes an angle of 30◦ with the free surface of water. Determine the total pressure and position of center of pressure when the upper edge is 1.5m below the free water surface
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