If `A=[[cosalpha, -sin alpha] , [sin alpha, cos alpha]]` then `A+A'=I` then `alpha=`

If A=[[cosalpha, sin alpha] , [-sin alpha, cos alpha]] and A^(-1)=A' then alpha=

If A= [[cos alpha, -sin alpha],[sin alpha, cos alpha]] , then A + A'= I, the value of a is :

A=[[Cos alpha,sin alpha],[-Sin alpha,cos alpha]] then A^(2)

If A=[[cos alpha, -sin alpha],[sin alpha, cos alpha]] , then A+A^T=I if the value of alpha is

A=[[cos alpha,sin alpha],[-sin alpha,cos alpha]] , then find | A |

If A=[(cos alpha, sin alpha),(-sin alpha, cos alpha)] then "AA"^(T)=

If A=[[cos alpha,sin alpha],[-sin alpha,cos alpha]] then verify that A'A=I

If A = [ (cos alpha ,- sin alpha ),(sin alpha ,cos alpha)] , then A + A' = I then the value of alpha is :