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જો $A = \left[ {\begin{array}{*{20}{c}}{\,\,\,\cos \alpha }&{\sin \alpha }\\{ - \sin \alpha }&{\cos \alpha }\end{array}} \right]$, તો ${A^2} = $
  • A$\left[ {\begin{array}{*{20}{c}}{\cos 2\alpha }&{\sin 2\alpha }\\{\sin 2\alpha }&{\cos 2\alpha }\end{array}} \right]$
  • B$\left[ {\begin{array}{*{20}{c}}{\cos 2\alpha }&{ - \sin 2\alpha }\\{\sin 2\alpha }&{\cos 2\alpha }\end{array}} \right]$
  • C$\left[ {\begin{array}{*{20}{c}}{\,\,\,\cos 2\alpha }&{\sin 2\alpha }\\{ - \sin 2\alpha }&{\cos 2\alpha }\end{array}} \right]$
  • D$\left[ {\begin{array}{*{20}{c}}{ - \cos 2\alpha }&{\sin 2\alpha }\\{ - \sin 2\alpha }&{ - \cos 2\alpha }\end{array}} \right]$
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