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an interesting picture, book Precalculus Mathematics : A Graphing Approach (3rd Edition)

[Image: 51bXTfBT62L._SX409_BO1,204,203,200_.jpg]
Who needs keyboards? Real mathematicians jump the R/C pins coming out of the CPU. Wink
I just bought it very cheap, to check it out.

Problem is that it probably will take about 3 months to arrive.

Thanks for posting
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