ACT Math Practice Question: Trigonometric Identities

Try this ACT math practice question on trigonometric identities:

For all $\theta$, the expression $\csc^{2} \theta \tan^{2} \theta – 1 $ is equivalent to:

1. $\quad \cot^{2} \theta$
2. $\quad \tan^{2} \theta$
3. $\quad \csc^{2} \theta$
4. $\quad \sec^{2} \theta$
5. $\quad \cos^{2} \theta$

Choice B