Integral Below One Curve
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To sketch an integral below one curve, make sure you are in Integral mode. Move your mouse until the start point of your integral is shown. I have picked the x intercept but I could also have picked any point on the curve. The important thing is to wait until FX Graph gives you a message indicating it has found the function.

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Click and hold the left mouse button, now move the mouse towards the end point of the integral. FX Graph will shade the integral as you go.
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Release the mouse button when you have reached the end point of the integral and FX Graph will shade the integral for you.

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If you move the cursor over the integral and "hover", FX Graph will display the details of the integral.

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