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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 .


	Contributed by: Soledad María Sáez Martínez and Félix Martínez de la Rosa
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Reference: H. Skala, "A discover-e," The College Mathematics Journal, 28(2), 1997 pp. 128–129.

Exponential Function (Wolfram MathWorld)

Origin (Wolfram MathWorld)

Tangent Line (Wolfram MathWorld)

"Tangent Lines to Exponential and Logarithmic Functions through the Origin" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/TangentLinesToExponentialAndLogarithmicFunctionsThroughTheOr/

Contributed by: Soledad María Sáez Martínez and Félix Martínez de la Rosa

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