a/ \(k=-1=tan\alpha\Rightarrow\alpha=135^0\)
b/ Phương trình d: \(y=kx+b\)
\(\Rightarrow\left\{{}\begin{matrix}0.k+b=1\\k.\left(-\sqrt{3}\right)+b=0\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}b=1\\k=\frac{1}{\sqrt{3}}\end{matrix}\right.\)
\(\Rightarrow tan\alpha=k=\frac{1}{\sqrt{3}}\Rightarrow\alpha=30^0\)