If A = [ array*20c 2θ & - 2θ 2θ & 2θ array ] and A + Aᵀ = I Where I is the unit matrix of 2 × 2 & Aᵀ is the transpose of
In easy words, after simplifying, 6 is left. The method is simple: formula → substitution → calculation → answer.
Ref: NCERT Mathematics Class XII — Matrices and Determinants
