InterviewSolution
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यदि `y=cos^(-1)((1-x^(2))/(1+x^(2)))`तो दिखाइए कि `(1+x^(2))(dy)/(dx)-2=0`. |
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Answer» `y=cos^(-1)((1-x^(2))/(1+x^(2)))` `x=tan theta ` रखने पर, `y=cos^(-1)((1-tan^(2)theta)/(1+tan^(2)theta))` `=cos^(-1)cos 2 theta` `= 2 theta` `=2 tan^(-1) x ` `:. (dy)/(dx)=(2)/(1+x^(2))` या `(1+x^(2))(dy)/(dx)-2=0` (यही दिखाना था ) |
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