If A=`[[cosalpha,sinalpha],[-sinalpha,cosalpha]]` then show that `A^2=[[cos2alpha,sin2alpha],[-sin2alpha,cos2alpha]]`

If A,=[[cos alpha,sin alpha-sin alpha,cos alpha]] then show that ,A^(2)=[[cos2 alpha,sin2 alpha-sin2 alpha,cos2 alpha]]

If A=[{:(cosalpha,sinalpha),(-sinalpha,cosalpha):}] , show that A^(2)=[{:(cos2alpha,sin2alpha),(-sin2alpha,cos2alpha) :}].

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

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

if A,=[[cos alpha,sin alpha-sin alpha,cos alphasin alpha,cos alphacos2 alpha,sin2 alpha-sin2 alpha,cos2 alpha]]

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

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_(alpha)=[(cosalpha,sinalpha),(-sinalpha,cosalpha)] then (A_(alpha))^2=?