Hi, the question is: starting from the definition of the complex cosine function, prove the trig identity: here's what i got and now i don't know what to do.. is this right so far? and can someone please help me finish it off?
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Originally Posted by Dgphru Hi, the question is: starting from the definition of the complex cosine function, prove the trig identity: here's what i got and now i don't know what to do.. is this right so far? and can someone please help me finish it off? You alredy did everything! ... Tonio
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