differentiation

Question: If $y=A\cos nx+B\sin nx,$ then $\frac{{{d}^{2}}y}{d{{x}^{2}}}=$



1) ${{n}^{2}}y$
2) $-y$
3) $-{{n}^{2}}y$
4) None of these
Solution: Explanation: No Explanation
Differentiation by substitution Higher order derivatives

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