Tangent Lines to Exponential and Logarithmic Functions through the Origin

For each exponential function , draw the tangent line through the origin. The points of tangency lie on the horizontal line Likewise, for the logarithmic functions , the points of tangency lie on the vertical line .


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Reference: H. Skala, "A discover-e," The College Mathematics Journal, 28(2), 1997 pp. 128–129.
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