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This is not a homework problem per se. The graph of [tex]cos^{2}(x)[/tex] doesn't look like what I'd expect when I graph it here: http://my.hrw.com/math06_07/nsmedia/tools/Graph_Calculator/graphCalc.html, in gnuplot, or on my TI-89. I would expect it to be periodic with a period of pi. However, if you graph in radians over a domain of 0-250 you get something quite bizarre I think. What's stranger is that the website I have linked to and gnuplot have a pretty similar graph, but my calculator's graph looks completely different. Could anyone explain to me what's going on here?