Question

Give me answer...... 2&3 ....

Answer 1

2) The principal value of cos⁻¹(-1/2) = $\pi$ - cos⁻¹(1/2) 
     = $\pi$ - {$\pi$ /3}
     =2$\pi$ / 3

3) aij = (1+2j)² / 2
=> a₁₁ = [1+2(1)]² / 2 = 9/2
=> a₁₂ = [1+2(2)]² / 2 = 25/2
=> a₂₁ = [2+2(1)]² / 2 = 8
=> a₂₂ = [2+2(2)]² / 2 = 18
So, the required 2 X 2 matrix is    9/2    25/2
                                                         8        18
Hope my answer helps you