1. ${\mathrm{P}}^2=\left|\begin{array}{cc}1& \cos \mathrm{\theta }\\ \cos \mathrm{\theta }& 1\end{array}\right|$

• A. ${\cos }^2\mathrm{\theta }$
• B. ${\cos }^2\mathrm{\theta }$
• C. ${\cos }^2\mathrm{\theta }$
• D. ${\cos }^2\mathrm{\theta }$

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