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The derivative at a point $x=c$ is defined as the slope of the line tangent to the curve at that exact location. Graphically, this is estimated by fixing an input $c$, adjusting a draggable control until the attached straight line visually aligns with the local steepness of the blue cubic curve, and then reading the corresponding numerical value from the answer panel.

Conditions: The underlying function is the polynomial $f(x)=2x^3$.; The ordinary derivative requires a finite, existing limit of the difference quotient (equivalently, a finite tangent slope).; Accuracy depends on visual estimation unless checked against known formulas.

The derivative at a point $x=c$ is defined as the slope of the line tangent to the curve at that exact location. Graphically, this is estimated by fixing an input $c$, adjusting a draggable control until the attached straight line visually aligns with the local steepness of the blue cubic curve, and then reading the corresponding numerical value from the answer panel.

Conditions: The underlying function is the polynomial $f(x)=2x^3$.; The ordinary derivative requires a finite, existing limit of the difference quotient (equivalently, a finite tangent slope).; Accuracy depends on visual estimation unless checked against known formulas.