{\large \begin{array}{l}{{\sin }^{2}}\alpha \,+\,{{\cos }^{2}}\alpha \,=1\,\,\,\,\,\,\,(trigonometrischer\,\,Pythagoras)\\\\\tan \alpha \,=\frac{\sin \,\alpha }{\cos \,\alpha }\,\,\,\,\,\,\,\,\,\,\,\,\,\cot \alpha \,=\frac{\cos \,\alpha }{\sin \,\alpha }\end{array} }