Ask Question
11 October, 06:45

Trigonometry

Angle Sum and Difference, Double Angle and Half Angle Formulas

Find the exact value of:

If sinx = 4/8, find Cos (6x)

+2
Answers (1)
  1. 11 October, 06:47
    0
    3√3

    Step-by-step explanation:

    If sinx = 4/8, find Cos (6x)

    we need to first find cos

    but applying trigonometry rule

    sin²x+cos²x = 1

    sinx = 4/8

    sin²x = (4/8) ² = 4²/8² = 16/64

    from the rule

    cos²x = 1 - sin²x = 1-16/64 = 64-16/64 = 48/64 = 3/4

    cos²x = 3/4

    cos x = √3/4 = √3/2

    cos 6x = 6 x √3/2 = 3√3
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “Trigonometry Angle Sum and Difference, Double Angle and Half Angle Formulas Find the exact value of: If sinx = 4/8, find Cos (6x) ...” in 📗 Mathematics if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers