Mark the tick against the correct answer in the following:

Question:

Mark the tick against the correct answer in the following:

$\left|\begin{array}{cc}\cos 15^{\circ} & \sin 15^{\circ} \\ \sin 15^{\circ} & \cos 15^{\circ}\end{array}\right|=?$

A. 1

B. $\frac{1}{2}$

C. $\frac{\sqrt{3}}{2}$

D. none of these

Solution:

 

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