Saved Bookmarks
| 1. |
If y = 5 cos x – 3 sin x, then d2y/dx2 is equal to :(a) - y(b) y(c) 25y(d) 9y |
|
Answer» Option : (a) y = 5 cos x − 3 sin x ⇒ dy/dx = −5 sin x − 3 cos x ⇒ d2y/dx2 = −5 cos x + 3 sin x = −y |
|