Verify that the function y = a cos x + b...

Verify that the function `y = a cos x + b sin x`, where a,b `in` R is a solution of the differential equation `(d^(2)y)/(dx^(2)) + y = 0`

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The correct Answer is:

L.H.S = (- a cos x - b sin x ) + (a cos x + b sin x) = 0 = R.H.S

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