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  1. 03-23-2015, 11:05 PM Top | #25
    Nov 2011
    1063
    0.21
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    Thanked: 503

    :

    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



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