If a sinA + b cosA = c, then a cosA – b sinA is equal to:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e √(a2 + b2 – c2).
| Understanding/Application |
| Here we need to use one identity of trigonometry when a sinA + b cosA = c, then a cosA – b sinA = √(a2 + b2 – c2) |