Addiecaminpo6
Addiecaminpo6
06-05-2017
Mathematics
contestada
result of tan 20º x tan 40º x tan 80º
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ghanami
ghanami
06-05-2017
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))
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