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    Question

    cot 17˚  

    src='https://static.ixambee.com/public/images/quesimg/Question Bank/Quantitative Aptitude/Trigonometry/83190_3055939.gif'>  cot 18˚    …………………….cot 72˚    cot 73˚ = ?
    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 17˚    cot 18˚    …………………….cot 72˚    cot 73˚ = (cot 17˚     cot 73˚ )   (cot 18˚     cot 72˚ )   …………………….(cot 44˚     cot 46˚ )   cot 45˚ = 1   1   ………………………………………………………………..   1   1  = 1

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