126. B) arcsin \frac{\sqrt{3}}{2} + arccos \frac{\sqrt{3}}{2};

B) arcsin \frac{\sqrt{3}}{2} + arccos \frac{\sqrt{3}}{2} = $$\frac{\pi}{3} + \frac{\pi}{6}$$ = $$\frac{2\pi + \pi}{6}$$ = $$\frac{3\pi}{6}$$ = $$\frac{\pi}{2}$$.

Ответ: $$\frac{\pi}{2}$$