(Section 1.11: Limits and Derivatives in Calculus) 1.11.3 Below, we let xapproach a Below, we let xapproach afrom the rightx±a+(). from the leftx±a². (SeeFootnote2.)• We define the slopeof the tangent line to be the (two-sided) limitof the difference quotient as xapproaches a, if that limit exists. • We denote this slope by ±fa, read as “fprime of (or at) a.” ±, the derivativeoffat a, is the slopeof the tangent lineto the graph
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