Question

If y(α) = √(2((tanα + cotα)/(1 + tan²α)) + 1/sin²α), α ∈ (3π/4, π) then dy/dα at α = 5π/6 is

(1) 4

(2) - 1/4

(3) 4/3

(-4) - 4

Answer 1

Answer is (1) 4

Answer 2

Answer is (1) 4