Which of the following is an identity? Also, please include an explanation.
sinθcotθsecθ = 0, sinθcotθsecθ = 1, sinθcotθsecθ = cot2θ, or sinθcotθsecθ = tan2θ?
[tex] cot\theta= \frac{ cos \theta}{ sin \theta } \\ sec\theta = \frac{1}{ cos \theta } \\ \\ \\ sin \theta cot\theta sec\theta \\ = sin \theta \cdot \frac{ cos \theta}{ sin \theta } \cdot \frac{1}{ cos \theta } \\ = \frac{ sin \theta}{ sin \theta } =1 \\[/tex]
