Dan Anderson @dandersod.recursiveprocess.com · Dec 16 Trying to teach the connections between the cosine and arccosine graphs. How's this for an idea? Give them a square sheet, fold at a diagonal. Draw the cosine graph on one side, flip the paper along the y=x line and then use ink bleed through to "see" arccosine (I'm sure it's been done already)
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That's how I taught the graph of all inverses. a) cut the paper into a square (with the x=y line going corner to corner) b) draw the full f(x) graph on both sides. c) hold onto the corners to minimize moving d) flip up/down one side then flip up/down the other e) discuss domain restrictions
I use patty paper. Then when they flip it over it’s easier to see through.