Вычислите (cos23°*cos22°-sin23°*sin22°)/(sin19°*cos26°+sin26°*cos19°).

\[= \frac{\cos(23{^\circ} + 22{^\circ})}{\sin(19{^\circ} + 26{^\circ})\ } = \frac{\cos{45{^\circ}}}{\sin{45{^\circ}}} =\]

\[= ctg\ 45{^\circ} = 1\]