Ask Question
28 February, 22:00

Let cos x = 1√10 with x in QIV and find: cot2x

+5
Answers (1)
  1. 28 February, 22:41
    0
    Cos x = 1/√10

    sin x = √ (1 - 1 / 10) = √9/10 = - 3/√10 (because x is in Q IV)

    cot 2 x = cos 2 x/sin 2x = (cos²x - sin²x) / (2 sinx cosx) =

    = (1/10 - 3/10) / (2 * (-3/√10) * 1/√10) = ( - 8/10) / (-6/10) = 8/6 = 4/3
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “Let cos x = 1√10 with x in QIV and find: cot2x ...” in 📘 Mathematics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers