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" (i) "(1-x^(2))/(sqrt(1+x^(2)))...

" (i) "(1-x^(2))/(sqrt(1+x^(2)))

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if tan^(-1){(sqrt(1+x^(2))-sqrt(1-x^(2)))/(sqrt(1+x^(2))+sqrt(1-x^(2)))}=alpha then