A line $A B$ in three-dimensional space makes angles $45^{\circ}$ and $120^{\circ}$ with the positiv

Question

A line $A B$ in three-dimensional space makes angles $45^{\circ}$ and $120^{\circ}$ with the positive $x$-axis and the positive $y$-axis respectively. If $A B$ makes an acute angle $	heta$ with the positive $z$-axis, then $	heta$ equals\

Professor PC Thomas Classes · Answer

(c)\