$$\textbf{Pytagoras}$$ $$a^2 + b^2 = c^2$$ $$Sin(A)=\frac{a}{c}$$ $$Cos(A)=\frac{b}{c}$$ $$Tan(A)=\frac{a}{b}$$ $$Cot(A)=\frac{b}{a}$$