Question

Let $f(\theta )=\left|\begin{array}{ccc}{\cos }^2\theta & \cos \theta \sin \theta & -\sin \theta \\ \cos \theta \sin \theta & {\sin }^{2}x& \cos \theta \\ \sin \theta & -\cos \theta & 0\end{array}\right|$ then $f\left(\frac{\pi }{6}\right)=$

• A. 0
• B. 1
• C. 2
• D. none

Answer 1

Answer: (B)

Correct answer is (b) 1