If $\sin \theta = \frac{1}{2}$,then $\theta = \ldots \ldots \ldots \ldots$ (in $^\circ$)

$\frac{2 \tan 30^{\circ}}{1+\tan ^{2} 30^{\circ}} = ?$

Evaluate the following:
$2 \tan ^{2} 45^{\circ}+\cos ^{2} 30^{\circ}-\sin ^{2} 60^{\circ}$

In a right triangle,if the length of the hypotenuse is $12$ and the measure of one of the angles is $30^{\circ}$,then the measure of the side opposite to the angle is $\ldots \ldots \ldots \ldots$

In $\Delta ABC$,$m \angle B = 90^{\circ}$ and $m \angle C = 30^{\circ}$. If $AC = 10$,then $AB = \ldots$

The value of $\sin^{2} 30^{\circ} - \tan 45^{\circ} + \cos^{2} 60^{\circ} - \cot 90^{\circ}$ is ........