Determine Which of the Following Are Trigonometric Identities $\cot ( \theta ) \csc ( \theta ) = \sec ( \theta )$

Determine which of the following are trigonometric identities.
I. $\cot ( \theta ) \csc ( \theta ) = \sec ( \theta )$
II. $\cot ( \theta ) \sec ( \theta ) = \csc ( \theta )$
III. $\sec ( \theta ) \csc ( \theta ) = \cot ( \theta )$
IV. $\cot ( \theta ) \sin ( \theta ) = 1$

A) II and IV are the only identities.
B) II is the only identity.
C) III is the only identity.
D) I, III, and IV are the only identities.
E) I is the only identity.

Correct Answer:

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