y=sin3x/x²,求dy
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y=sin(3x)/x^2
dy
= [x^2 dsin(3x) - sin(3x) dx^2 ]/x^4
= [x^2 (cos(3x)) d(3x) - sin(3x) (2x dx) ]/x^4
= [x^2 (cos(3x)) (3dx) - sin(3x) (2x dx) ]/x^4
= [3cos(3x).x^2 - 2x.sin(3x)] dx/x^4
= [3cos(3x).x - 2sin(3x)] dx/x^3
= { [3cos(3x).x - 2sin(3x)]/x^3 } dx
dy
= [x^2 dsin(3x) - sin(3x) dx^2 ]/x^4
= [x^2 (cos(3x)) d(3x) - sin(3x) (2x dx) ]/x^4
= [x^2 (cos(3x)) (3dx) - sin(3x) (2x dx) ]/x^4
= [3cos(3x).x^2 - 2x.sin(3x)] dx/x^4
= [3cos(3x).x - 2sin(3x)] dx/x^3
= { [3cos(3x).x - 2sin(3x)]/x^3 } dx
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