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    • Question

      cot 13˚  

      src='https://static.ixambee.com/public/images/quesimg/Question Bank/Quantitative Aptitude/Trigonometry/83188_8502454.gif'>  cot 14˚    …………………….cot 76˚    cot 77˚ = ?
      A 1 Correct Answer Incorrect Answer
      C -1 Correct Answer Incorrect Answer
      D 2 Correct Answer Incorrect Answer

      Solution

      We know that  If cotA cotB = 1 then A & B are complementary angles it means A + B = 90˚ cot 13˚    cot 14˚    …………………….cot 76˚    cot 77˚ = (cot 13˚     cot 77˚ )   (cot 13˚     cot 77˚ )   …………………….(cot 44˚     cot 46˚ )   cot 45˚ = 1   1   ………………………………………………………………..   1   1  = 1

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