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来自维基百科,自由的百科全书
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English: Steam train engine Date 3 January 2012 Source Own work Author Vittesh55
File:Trigonometry.pdf
Pythagoras 1. sin2(x) + cos2(x) = 1 2. 1 + tan2(x) = sec2(x) 3. 1 + cot2(x) =
csc2
(x) These are all direct consequences of Pythagoras's theorem. Sum/Difference