NDA 2017 Mathematics question
If , and are the angles which the vector (O being the origin) makes with positive direction of the coordinate axes, then which of the following are correct? 1. 2. 3. Select the correct answer using the code given below.
Answer: (C)
Solution
Direction cosines satisfy . So (1 correct), and
See the full step-by-step solution
Create a free account to read the complete working, and practise questions like this in a timed test.
Create a free account