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cosecs

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For the first one, write out the cosecs and cots in terms of sine, cosine and tangent, and then consider cos(270+x) and see if you can simplify it (remember, adding something to x results in shifting the graph horizontally). Once you've done all that it should be easy enough to prove. — “Wikipedia:Reference desk/Archives/Mathematics/2009 May 7”, en.wikipedia.org

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