Limit at Infinity Approximator

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Left Right Limit Approximation

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Secant Line Limiting to Tangent Line Tool

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Use the slider to adjust how far the two points on the secant line (the red line) are

Linear Approximation Visualization

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Use this tool to zoom in on a function, and the tangent line, at a point.

Notice how the derivative and the function are indistinguishable when you zoom in really close.