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

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

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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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.
Oh you're helpful.
It might look more familiar if you rationalize.

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Other answers:

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.
Isn't this site meant for people who are having trouble to get help from other people?
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.
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.
Calm down and be rational. See what i did there?
cos-1(A) = B is equivalent to saying A = cos(B)
so if cos-1(1/sqrt(2)) = B means 1/sqrt(2) = cos(B) Does that help at all ?

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