" 35.If "A=[[cos alpha,-sin alpha],[sin alpha,cos alpha]]," then for what value "

If A=[[cos alpha,-sin alpha],[sin alpha,cos alpha]], then for what value of alpha is A an identity matrix?

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

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

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

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

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

If A_alpha = [(cos alpha, sin alpha),(-sin alpha, cos alpha)] , then what is the value of A_alphaA_beta .