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[" 14.uद् "tan^(-1)[(sqrt(1+x^(2))-sqrt(...

[" 14.uद् "tan^(-1)[(sqrt(1+x^(2))-sqrt(1-x^(2)))/(sqrt(1+x^(2))+sqrt(1-x^(2)))]=alpha" है तो सिद्ध कीजिए रिक "],[qquad x^(2)=sin2 alpha]

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