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˚ = ?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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