1.

If y = a cos 2x + b sin 2x, then

A. \(\frac{{{d^2}y}}{{d{x^2}}} + y = 0\)
B. \(\frac{{{d^2}y}}{{d{x^2}}} + 2y = 0\)
C. \(\frac{{{d^2}y}}{{d{x^2}}} - 4y = 0\)
D. \(\frac{{{d^2}y}}{{d{x^2}}} + 4y = 0\)
Answer» E.


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