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Mark the tick against the correct answer in the following:

Question:

Mark the tick against the correct answer in the following:

$\left|\begin{array}{cc}\cos 70^{\circ} & \sin 20^{\circ} \\ \sin 70^{\circ} & \cos 20^{\circ}\end{array}\right|=?$

A. 1

B. 0

C. $\cos 50^{\circ}$

D. $\sin 50^{\circ}$

Solution:

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