If A and B are measures of acute angles and tanA = and sinB = , then cos(A + B) is ………………..

Question

Philoid · Accepted Answer

tanA =also tan30 =⇒ A = 30Sin B =⇒ B = 30⇒ A + B = 30 + 30 = 60⇒ cos(A + B) = Cos(60)