>> derivative of f(x) is the slope of the function at that point
a) f ' (0) = -1 ( = dy/dx = 1/-1 = -1)
b)f '(1) = 0 since the function is paralell to x axis
c) f ' (2 ) = 1 ( since dy/dx = 1/1 =1)
d) f ' (3 ) = 1
e) f '(4) = 0 since paralell
f) f ' (5) = -1 ( dy/dx = 1/-1 = -1 )
NOTE : dy/dx = change in y / change in X
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