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(sinA sin 2A + sin 3A sin 6A+ sin4A sin1...

`(sinA sin 2A + sin 3A sin 6A+ sin4A sin13A)/(sinAcos2A+sin3Acos6A+sin4Acos13A)=tan 9A`

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sin A sin2A + sin3A sin6A-sin4A sin5A = 0

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