Question 18
If y = cos3x, then yn is given by
A. [3" cos(3x – m.) + 3cos (x - 1)]
B. a
3cos (x + ")]
C. [3” cos (3x +
cos(3x + 1) + 3cos (x + ")]
3n cos ( 3x +
2
D. None of these
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