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Excel Math: Pi Day Bulletin Board and Ideas for the Math Class
Compare cosine(pi/2+x),sin(pi/2+x),cos(pi+x),sin(pi+x) with sinx and
MULTIPLY PI - Home
Solved Show a table of values (using multiples of Pi/12) and | Chegg.com
pi times 2 visualized - YouTube
xkcd: e to the pi times i
2 Pi or Not 2 Pi?—Wolfram Blog
How to Use Pi to Compute Area and Circumference | Sciencing