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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. | |