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CBSE Class 12-science Answered

If a>b>c>0, Prove that  Cot^-1 [(ab+1)÷(a-b)]+ Cot^-1 [(bc+1)÷(b-c)]+Cot^-1[(ca+1)÷(c-a)]= pi 
Asked by mridulabarua05 | 21 Feb, 2019, 01:05: PM
Expert Answer
begin mathsize 16px style cot to the power of negative 1 end exponent open parentheses fraction numerator ab plus 1 over denominator straight a minus straight b end fraction close parentheses plus cot to the power of negative 1 end exponent open parentheses fraction numerator bc plus 1 over denominator straight b minus straight c end fraction close parentheses plus cot to the power of negative 1 end exponent open parentheses fraction numerator ca plus 1 over denominator straight c minus straight a end fraction close parentheses
equals tan to the power of negative 1 end exponent open parentheses fraction numerator straight a minus straight b over denominator 1 plus ab end fraction close parentheses plus tan to the power of negative 1 end exponent open parentheses fraction numerator straight b minus straight c over denominator 1 plus bc end fraction close parentheses plus tan to the power of negative 1 end exponent open parentheses fraction numerator straight c minus straight a over denominator 1 plus ca end fraction close parentheses
equals tan to the power of negative 1 end exponent straight a minus tan to the power of negative 1 end exponent straight b plus tan to the power of negative 1 end exponent straight b minus tan to the power of negative 1 end exponent straight c plus tan to the power of negative 1 end exponent straight c minus tan to the power of negative 1 end exponent straight a
equals 0 end style
 
 
 
 
 
 
 
NOTE: Please check RHS side of the question.
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