By considering the gradient of a suitable sequence of chords, find a value for the gradient of

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By considering the gradient of a suitable sequence of chords, find a value for the gradient of the curve at the given point.
a. y = x4 at (1, 1) 

b. y = x2 − 2x + 3 at (0, 3)
c. y = 2√x at (4, 4) 

d. y = 12/x at (2, 6)

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