Odečti úhly:
\( \alpha-\beta \), kde \( \alpha=56^{\circ}17^{\prime},\beta=74^{\circ}15^{\prime} \)
\( 17^{\circ} 58^{\prime} \)
\( -17^{\circ} 58^{\prime} \)
\( -18^{\circ} 02^{\prime} \)
\( -16^{\circ} 57^{\prime} \)