Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Complete the identity.
- $$\csc ^ { 2 } \frac { \theta } { 2 } - \sec ^ { 2 } \frac { \theta } { 2 } = ?$$

A) $2 \sin ^ { 2 } \theta \sec \theta$
B) $\frac { 2 } { 1 }$
C) 0
D) $4 \cot \theta \csc \theta$ θ