Question

If a directed line $OP$ makes angles ${45}^o,{60}^o$ & ${60}^o$ with $+ve$ direction of $x,y,z$ axis respectively then find d.cs of $OP$

Answer 1

Given the line $OP$ makes angles ${45}^o,{60}^o,{60}^o$ with the positive direction of $x,y,z$ axis respectively.

Then the direction cosines (d.cs) of $OP$ be respectively $\cos {45}^o,\cos {60}^o,\cos {60}^o$ i.e. $\frac{1}{\sqrt{2}},\frac{1}{2},\frac{1}{2}$.