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Calculus Made Easy
negative value; hence will have negative sign also.
If the “curve” happens to be a straight line, like that in Fig. 12, the value of will be the same at all points along it. In other words its slope is constant.
Fig. 12.
If a curve is one that turns more upwards as it goes along to the right, the values of will become
Fig. 13.
greater and greater with the increasing steepness, as in Fig. 13.