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If tan^(-1){(sqrt(1+x^2)-sqrt(1-x^2))/(s...

If `tan^(-1){(sqrt(1+x^2)-sqrt(1-x^2))/(sqrt(1+x^2)+sqrt(1-x^2))}=alpha` , then `x^2=` `sin2\ alpha` (b) `sin\ alpha` (c) `cos2\ alpha` (d) `cos\ alpha`

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