Question
Evaluate:
$\begin{vmatrix} \sin30^{o} & \cos30^{o} \\ -\sin60^{o} & \cos60^{o} \\ \end{vmatrix}$.
$\begin{vmatrix} \sin30^{o} & \cos30^{o} \\ -\sin60^{o} & \cos60^{o} \\ \end{vmatrix}$.
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$(2\hat{\text{i}}+6\hat{\text{j}}+27\hat{\text{k)}}\times(\hat{\text{i}}+3\hat{\text{j}}+\text{p}\hat{\text{k}})=\vec{0}.$