#16 Precalculus questions

label Mathematics
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May 15th, 2015

As we know, tan(a+b) = (tan(a) + tan(b))/(1 - tan(a)*tan(b)).

Substitute a=5deg, b=25deg and obtain that the expression in question equals to

tan(5+25) = tan(30deg) = 1/sqrt(3) = sqrt(3)/3 (the second variant).

May 15th, 2015

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