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Play with trig functions!
Click the name of a trig function. A line segment on the unit circle picture will become pink: The length of this line segment is the value of the trig function for the given value of theta.
You can drag the point around on the circle, or on the graph of the trig function to the right.
Make sure you understand why each trig function has the shape it does. Where are they increasing or decreasing? Where are their asymptotes? Where do they acheive their maxima and minima?