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Result of tan 20º x tan 40º x tan 80º
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Result of tan 20º x tan 40º x tan 80º

User ZSergei
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hello :
look : 40 = 2×20 80 = 2×40
knowing tan 20º by calculator , for 40° , 80°use the identity :
tan (2x) = (2tan(x))/(1-tan²(x))

User Config
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