If $$\cos x=\frac{24}{25}$$ and $$x$$ lięs in first quadrant, then $$\sin \frac{x}{2}+\cos \frac{x}{2}=$$

The value of $$\sin 18^{\circ}$$ is

$$\frac{1-\sin \theta+\cos \theta}{1-\sin \theta-\cos \theta}=$$

If $A$ and $B$ are supplementary angles, then $\sin ^2 \frac{A}{2}+\sin ^2 \frac{B}{2}=$