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(sin x)^2dx=x/2-1/4*sin(2x)+C 不信的話,你可以求一下導 因為d(cos(x))=sin(x) 所以(sin(x))^2dx=sin(x)d(cos(x)) =√(1-cos(x)^2)d(cos(x)) 即轉變為√(a^2-x^2)dx的形式了.
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