If `A = [[cosalpha,-sinalpha],[sinalpha,cosalpha]]` then `A A'= I`, if the value of `alpha` is

If A = [[cosalpha, -sinalpha],[sinalpha,cosalpha]] and A + A' = I , then the value of alpha is:

If A=[[cosalpha,-sinalpha],[sinalpha,cosalpha]] , then A+A^(prime)=I , if the value of alpha is (A) pi/6 (b) pi/3 (c) pi (d) (3pi)/2

If A=[[cosalpha, sinalpha], [-sinalpha, cosalpha]] , then A^(10)=

if A=[[cosalpha,sinalpha],[-sinalpha,cosalpha]] be such that A+A'=I then alpha

If A=[{:(cosalpha,-sinalpha),(sinalpha,cosalpha):}]andA+A'=I , then find the value of alpha .

If A_(alpha)=[(cosalpha,-sinalpha),(sinalpha,cosalpha)] , then