Question:
Mark the tick against the correct answer in the following:
$\left|\begin{array}{cc}\sin 23^{\circ} & -\sin 7^{\circ} \\ \cos 23^{\circ} & \cos 7^{\circ}\end{array}\right|=?$
A. $\frac{\sqrt{3}}{2}$
B. $\frac{1}{2}$
C. $\sin 16^{\circ}$
D. $\cos 16^{\circ}$
Solution:
