By writing x 2 (x 2 + 2x - 5/x 2 ) = x 4 + 2x

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By writing x2 (x2 + 2x - 5/x2) = x4 + 2x3 - 5, differentiate x(x2 + 2x -5/2).
Use a similar approach to differentiate
(a) x2(3x – 4)
(b) x(3x3 – 2x2 + 6x – 7)
(c) (x + 1)(x – 6)
(d) x2 - 3/x
(e) x - 4x2/x3
(f) x2 - 3x + 5/x2

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