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Integral Approximation, LH, RH, Trap

This shows approximations using the left hand rectangles, right hand ones, midpoints, and traps. Things you can change: 1. There are three sliders. Move them for results. Can you believe you used to do this by hand? 2. You can grab the red lines to move them to change the a and b values. It doesn't matter which one is first. 3. You can also change the function.