Evaluate \(\begin{vmatrix}-sinθ&-1\\1&sin⁡θ\end{vmatrix}\).

1.	Evaluate \(\begin{vmatrix}-sinθ&-1\\1&sin⁡θ\end{vmatrix}\).
A.	cos2⁡θ
B.	-cos2⁡θ
C.	cos⁡2θ
D.	cos⁡θ
Answer» B.

Discussion

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Evaluate \(\begin{vmatrix}1&1&-2\\3&4&5\\-1&2&1\end{vmatrix}\).
Evaluate \(\begin{vmatrix}i&-1\\-1&-i\end{vmatrix}\).
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Evaluate \(\begin{vmatrix}2&5\\-1&-1\end{vmatrix}\).