Ask Question
16 September, 10:26

Cos X + 1 / cos X=40, find the value of cos square X + 1 / cos square X

+2
Answers (1)
  1. 16 September, 13:02
    0
    This is pseudo-trig. It has a trig function but it's irrelevant.

    Let y = cos X

    y + 1/y = 40

    Squaring,

    y² + 2 (y) (1/y) + 1/y² = 1600

    y² + 2 + 1/y² = 1600

    y² + 1/y² = 1598

    cos² X + 1/cos²X = 1598

    Answer: 1598
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “Cos X + 1 / cos X=40, find the value of cos square X + 1 / cos square X ...” in 📙 Mathematics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers