[" far "a^(2)+b^(2)+c^(2)+2abc=1],[" 7."...

[" far "a^(2)+b^(2)+c^(2)+2abc=1],[" 7."4f'au=cot^(-1)sqrt(cos2 theta)-tan^(-1)sqrt(cos2 theta)(1)/(8)" an "(1)/(1)sqrt(44)],[" anffare "f(x)sin u=tan^(2)theta],[" 8."4f(x)tan^(-1)[(sqrt(1+x^(2))-sqrt(1-x^(2)))/(1-x^(2))]=a(1)/(8)" at fus "]

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