Tan 9- tan 27-tan 63+ tan 81

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tan 9 - tan 27 - tan 63 + tan 81 =

tan 9^{o} - tan 27^{o} - tan 63^{o} + tan 81^{o} =

tan $9^{\circ}$ - tan $27^{\circ}$ - tan $63^{\circ}$ + tan $81^{\circ}$ =

81^{0}

63^{0}

27^{0}

9^{0}

tan 9^{o} \times tan 27^{o} \times tan 63^{o} \times tan 81^{o} =

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