Chapter 4.2, Problem 10EQ

Compute the determinants in Exercises 7-15 using cofactor expansion along any row or column that seems convenient.

$\left[\begin{array}{ccc}\cos \theta & \sin \theta & \tan \theta \\ 0& \cos \theta & -\sin \theta \\ 0& \sin \theta & \cos \theta \end{array}\right]$