(a)For |x|<1 prove that d -1
---(cosx)^-1 = --------
dx √(1-x^2)
(b)Find a power series representation for (cosx)^-1
沒有頭緒.....><
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※ 編輯: lenta 來自: 140.136.150.31 (07/03 11:37)