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Question 7 A curve has equation

`y=(1)/(5)(5x^(4)-20x^(3))`

. a) i) Find

`(dy)/(dx)`

. [ 2 ] ii) Find the coordinates of the stationary values on the curve. [ 3 ] b) For each stationary value, use calculus to determine if it is a maximum, a minimum or a point of inflexion. [ 4 ]