Ex 3: Estimate the Value of a Derivative at a Point on a Graph Using a Tangent Line

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This video provides an example of how to approximate the slope of a tangent line to approximate the value of the derivative function at a point on a function.
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How do you know that is the correct tangent line? Different angles may change the slope

kavinthegreat
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how to get the tangent line, draw the line go through just exactly that point that dont touch or met anywhere of the slope. it mean u can draw many tangent line but just draw the easiest one to calculated and stuff.

tuanriccy
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What if I dont have y-values available to me?

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