※ 引述《lenta (若無其事)》之銘言:
: -1 2
: (tan x)
: S---------- dx = ??
: 2
: 1 + x
: 不會解...
: 能告訴我要用哪個定理或方式嗎??
tan(-1)x=1/(1+x^2)
普通的代換就行了
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