(sec^2θ + 2tanθcotθ – tan^2θ) चे मूल्य किती आहे? A. 0 B. 1 C. 2 D. 3

Use sec²θ − tan²θ = 1 and tanθ × cotθ = 1. Then sec²θ + 2tanθcotθ − tan²θ = (sec²θ − tan²θ) + 2(tanθcotθ) = 1 + 2 × 1 = 3.