tanx tan(60 - x) tan(60 + x) = tan(3x))
put x = 6
tan6 tan54 tan66 = tan18
put x = 18
tan18 tan42 tan78 = tan54
.
tan6 tan54 tan66 tan18 tan42 tan78 = tan18 tan54
tan6 tan66 tan42tan78 = 1
tanx tan(60 - x) tan(60 + x) = tan(3x))
put x = 6
tan6 tan54 tan66 = tan18
put x = 18
tan18 tan42 tan78 = tan54
.
tan6 tan54 tan66 tan18 tan42 tan78 = tan18 tan54
tan6 tan66 tan42tan78 = 1
: 1 (0 1 )
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