If `A=[(costheta, -sin theta ),(sin theta, cos theta) ]` , then the matrix `A^(-50)` when `theta=pi/12`, is equal to :
A. `[{:(,(1)/(2),-(sqrt3)/(2)),(,(sqrt3)/(2),(1)/(2)):}]`
B. `[{:(,(sqrt3)/(2),(1)/(2)),(,-(1)/(2),(sqrt3)/(2)):}]`
C. `[{:(,(sqrt3)/(2),-(1)/(2)),(,(1)/(2),(sqrt3)/(2)):}]`
D. `[{:(,(1)/(2),(sqrt3)/(2)),(,-(sqrt3)/(2),(1)/(2)):}]`
