1.

Verify that y = 4 sin 3x is a solution of the differential equation \(\frac{d^2y}{dx^2}+9y = 0.\)

Answer»

The differential equation is \(\frac{d^2y}{dx^2}+9y = 0\) and the function that is to be proven as the solution is y = 4 sin 3x, now we need to find \(\frac{d^2y}{dx^2}.\)

\(\frac{dy}{dx}\) = 12 cos 3x

\(\frac{d^2y}{dx^2}\) = – 36 sin 3x

Putting the values in the equation, we get,

–36 sin 3x + 9(4 sin 3x) = 0,

0 = 0

As, L.H.S = R.H.S. the equation is satisfied, so hence this function is the solution of the differential equation.



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