\[2{{\cos }^{2}}\theta -2{{\sin }^{2}}\theta =1\],then \[\theta \]= [Karnataka CET 1998]

\[2{{\cos }^{2}}\theta -2{{\sin }^{2}}\theta =1\],then \[\theta \]= [K

1.	\[2{{\cos }^{2}}\theta -2{{\sin }^{2}}\theta =1\],then \[\theta \]= [Karnataka CET 1998]
A.	\[15{}^\circ \]
B.	\[30{}^\circ \]
C.	\[45{}^\circ \]
D.	\[60{}^\circ \]
Answer» C. \[45{}^\circ \]

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\[2{{\cos }^{2}}\theta -2{{\sin }^{2}}\theta =1\],then \[\theta \]= [Karnataka CET 1998]

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