find the nth differention coefficient of sinx cos3x
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Apply product rule
1st d/dx( 2nd) + 2nd d/dx (1st)
sin x { - sin3x (3)} + cos 3x { cos x}
-3 sin x sin 3x + cos x cos 3x
cos 4x - cos 2x
( cos c - cos d = -2 sin c-d /2 cos c-d /2)
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