A) \[{{\sin }^{4}}\theta \]
B) \[{{\cos }^{4}}\theta \]
C) \[{{\operatorname{cosec}}^{4}}\theta \]
D) \[{{\sec }^{4}}\theta \]
Correct Answer: B
Solution :
\[1-2{{\sin }^{2}}\theta +{{\sin }^{4}}\theta \] \[={{(1-{{\sin }^{2}}\theta )}^{2}}={{({{\cos }^{2}}\theta )}^{2}}={{\cos }^{4}}\theta \]
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