Question

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

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

Jun 17, 2013

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

tan(25°+5°) = tan 30° = 1/√3

Jun 17, 2013

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