# For those who don't know part 1 (Determinants)

Algebra Level 1

$$X=\begin{vmatrix} -\sin { \theta } & \cos { \theta } \\ -\cos { \theta } & -\sin { \theta } \end{vmatrix}$$.

Find the value of determinant ($$X$$).

###### If you don't know how to expand determinants, look at this note WIKI.
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