If A= [ array ll a & b b & a array ] and A^ 2 = [ array ll x & & x array ] , then

Mathematics · JEE Main · NTA Exams — Matrices and Determinants

1. \(\text { II }\) = a² + b² and \(\beta\) = ab
2. \(\text { II }\) = a² + b² and \(\beta\) = 2ab
3. \(\text { II }\) = a² + b² and \(\beta\) = a² - b²
4. \(\text { II }\) = 2ab and \(\beta\) = a² + b²

Answer

(B) II = a 2 + b 2 and = 2ab

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