EINSTEIN | Vestibular 2026 – Questão 45

QUESTION 45 In the plane, right triangles ABC and CDE are such that point D lies on side AB, as shown in the figure. Knowing that tan(α + β) = 1, tan α = 3/4, and that, given angles x and y, tan(x + y) = (tan x + tan y)/(1 – tan x • tan y), the value of tan δ is: (A) 1/4 (B) 1/3 (C) 1/5 (D) 1/6 (E) 1/7 ----------------------------------------------------------------------------------------------------------------------- SUBSCRIBE TO THE CHANNEL: @profjosemathias ➡️ FOLLOW MY SOCIAL MEDIA: INSTAGRAM:   / prof.josemathias