Secant and Tangent Lines

Secant and Tangent lines

Drag B towards A. Notice that the secant line (green line) converges toward the tangent line (blue line). [br]Move A to a different place. Can you move A anywhere so that this doesn't work?
Try it with different functions.[br][br]Here are some suggestions:[br]f(x)=sin(x)[br]f(x)=x^(2/3)[br]f(x)=x^(1/3)[br][br]Pay particular attention to what happens to the secant line when A is at the origin.

Upper and lower Riemann Sums

This applet shows how upper and lower Riemann sums can approximate an integral [math]\int^b_a f(x) \, \textrm{d}x[/math][br]Further, they show that as the number of strips [math]n[/math] increases, the Riemann sums converge to true value of the definite integral.[br]Input your own function into the textbox and set the limits to different values.

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