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Can someone please answer. There is one problem. There's a picture. Thank you!

Can someone please answer. There is one problem. There's a picture. Thank you!
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5 votes
Can someone please answer. There is one problem. There's a picture. Thank you!

Can someone please answer. There is one problem. There's a picture. Thank you!-example-1
User Yergo
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1 Answer

6 votes

\cos x=-1\ then\ x=180^o\ and\ x=-180^o
User Renskiy
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