What is x in this equation?

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What is x in this equation?

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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\[\cos^2x +3cosx+2 = 0\]
u = cosx
Oh then its just a quadratic :O

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:P What happens to the cos though? Do it after?
u^2 + 3u + 2 = 0 solve for u then later sub it back in btw is it only me that latex is not working?
Okay, thank you. I think its just you:O
np
I can't believe I didn't see it was just a simple quadratic *.*
well using a substitution is easier; at times when you see like the x squared; there is a high chance that its a quadratic. so use a substitution.
Alright! Thank you so much:D

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