Question

If y = 5 cos x – 3 sin x, then `("d"^2"y")/("dx"^2)` is equal to:

Options

• –y

• y

• 25y

• 9y

Answer 1

–y

Explanation:

y = 5 cos x – 3 sin x

`"dy"/"dx"` = −5 sin x − 3 cos x

`("d"^2"y")/("dx"^2)` = −5 cos x + 3 sin x

= −y