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हल करे : `tan^(-1)"" (1-x)/(1+x) = (1)/(2) tan^(-1) x(x gt 0)` |
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Answer» दिया है, `tan^(-1) x = 2 tan^(-1) ((1-x)/(1+x))` ` = tan^(-1) ""(2((1-x)/(1+x)))/(1-((1-x)/(1+x))^(2))" "[because 2 tan^(-1) x = tan^(-1)""(2x)/(1-x^(2))]` `= tan^(-1)""(2(1-x)(1+x))/((1+x)^(2)-(1-x)^(2))` `= tan^(-1) ""(2(1-x^(2)))/(4x)` `therefore tan^(-1) x = tan^(-1)"" (1-x^(2))/(2x)` `therefore x = (1-x^(2))/(2x) " "[because tan^(-1)` एकैकी फलन है] `rArr 2x^(2) = 1-x^(2) " " rArr 3x^(2) = 1` `rArr x = pm (1)/(sqrt(3)) " " therefore x = (1)/(sqrt(3))" "[because x gt 0]` |
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