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f'(x) is positive(above x-axis)
f(x) is increasing
f'(x) is negative (below x-axis)
f(x) is decreasing
f'(x) changes from negative to positive ( from below to above x-axis)
f(x) has local min
f'(x) changes from negative to positive
From below to above x-axis
f'(x) changes from positive to negative (from above to below x-axis)
f(x) has local max
f'(x) changes from positive to negative
From above to below x-axis
f'(x) is increasing (positive slope)
f(x) is concave up
f'(x) is decreasing (negative slope x)
f(x) is concave down
f'(x) change from decreasing to increasing
point of inflection
f'(x) change from increasing to decreasing
point of inflection