If A = [cos α −sin α]यदि A =
If A =
[cos α −sin α]
[sin α cos α]
and A + A′ = I, then the value of α is
यदि A =
[cos α −sin α]
[sin α cos α]
तथा A + A′ = I, तो α का मान है
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Correct answer: (B) π/3π/3
Explanation
A + A′ = [2cos α 0; 0 2cos α] = I requires 2 cos α = 1, so α = π/3.A + A′ = [2cos α 0; 0 2cos α] = I के लिए 2 cos α = 1 आवश्यक है, अतः α = π/3।