A) \[{{\cos }^{2}}\theta -{{\sin }^{2}}\theta =1\]
B) \[{{\operatorname{cosec}}^{2}}\theta -{{\sec }^{2}}\theta =1\]
C) \[{{\cot }^{2}}\theta -{{\tan }^{2}}\theta =1\]
D) \[se{{c}^{2}}\theta -{{\tan }^{2}}\theta =1\]
Correct Answer: D
Solution :
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