Вычисли

а) \(\sqrt{2} \sin 45\degree - \cos 30\degree \sin 60\degree + \ctg 45\degree \tg 135\degree - \tg 0\degree = \) [ ];

б) \(\sin \dfrac{\pi}{3} + \sqrt{2} \cos \dfrac{\pi}{4} - \sqrt{3} \ctg \cfrac{\pi}{6}= \) [ ].