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



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