当|x|≤1时,arcsin(2x/(1+2x^2))=2arctanx
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当|x|≤1时,arcsin(2x/(1+2x^2))=2arctanx当|x|≤1时,arcsin(2x/(1+2x^2))=2arctanx当|x|≤1时,arcsin(2x/(1+2x^2))=
当|x|≤1时,arcsin(2x/(1+2x^2))=2arctanx
当|x|≤1时,arcsin(2x/(1+2x^2))=2arctanx
当|x|≤1时,arcsin(2x/(1+2x^2))=2arctanx
额
当|x|≤1时,arcsin(2x/(1+2x^2))=2arctanx
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