cos x - cos y sin x - sin y(adsbygoogle = window.adsbygoogle || []).push({});

sin x + sin y + cos x + cos y = 0

or to see better i guess....

(cos x - cos y)/(sin x + sin y) + (sin x - siny)/(cos x + cos y) = 0

can you guys help me? i'm really stuck on this!

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# Verifying Trig Identities help!

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