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March 28, 2017

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Use a sum or difference identity to find the exact value.

tan 25deg + tan 5deg / 1-tan 25deg tan 5deg

  • trig - ,

    tan(x+y) = (tanx + tany)/(1-tanx tany)
    so, what you have is

    tan(25°+5°) = tan 30° = 1/√3

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