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Mathematics
OpenStudy (anonymous):

step by step proof of http://www3.wolframalpha.com/Calculate/MSP/MSP242419g24gg4b0678c0200005884ce0f7g6dfi5f?MSPStoreType=image/gif&s=7&w=180&h=39

myininaya (myininaya):

you want to show this identity?

myininaya (myininaya):

myininaya (myininaya):

any questions?

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