differentiation

Question: If $y=a\cos \,(\log x)+b\sin \,(\log x)$ where $a,\,b$ are parameters then ${{x}^{2}}{y}''\,+\,x{y}'\,=$

1) $y$

2) $-y$

3) $2y$

4) $-2y$

Solution:

Explanation: No Explanation

Differentiation by substitution Higher order derivatives

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