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heygirlhey

  • 5 years ago

What is cos-1 (-1/sqrt2)?

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  1. nowhereman
    • 5 years ago
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    Common, you can really look that up in any formula book or at wikipedia. Just look for special values of trigonometric functions.

  2. heygirlhey
    • 5 years ago
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    Oh you're helpful.

  3. anonymous
    • 5 years ago
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    It might look more familiar if you rationalize.

  4. nowhereman
    • 5 years ago
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    I suppose this is meant ironically. But I will forgive your misguidedness. Asking others for a solution to a specific problem will not bring you far. There will not always be someone competent there to help you. The basics in every science and especially math is looking things up in the literature, furthermore as these topics are so common.

  5. heygirlhey
    • 5 years ago
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    Isn't this site meant for people who are having trouble to get help from other people?

  6. nowhereman
    • 5 years ago
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    Yes, only not for letting others solve their assignments, but being taught how to do it. And I told you, this can be looked up quite easily.

  7. heygirlhey
    • 5 years ago
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    Yes, you told me to "look it up." That's not very helpful. It's more rude than anything. If I knew what it was, I wouldn't have posted this.

  8. anonymous
    • 5 years ago
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    Calm down and be rational. See what i did there?

  9. Yuki
    • 5 years ago
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    cos-1(A) = B is equivalent to saying A = cos(B)

  10. Yuki
    • 5 years ago
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    so if cos-1(1/sqrt(2)) = B means 1/sqrt(2) = cos(B) Does that help at all ?

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