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[" (硬) "tan^(-1)((2x)/(1-x^(2)))" कil "c...

[" (硬) "tan^(-1)((2x)/(1-x^(2)))" कil "cos^(-1)((1-x^(2))/(1+x^(2)))" के सापे क्ष अककल गुषांक जात्त "],[" कीजिए। "]

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