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[X(" ii) "cos^(-1)((1-a^(2))/(1+a^(2)))-...

[X(" ii) "cos^(-1)((1-a^(2))/(1+a^(2)))-cos^(-1)((1-b^(2))/(1+b^(2))),=2tan^(-1)((a-b)/(1+ab))],[,(UP2003,07,14,18)]

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