3 下列那一組函數是線性相依（linear dependent）？ 
 
(A)y1=cos wx;y2 =sin wx
 
(B)y1=ex, y2=e2x,y3=xex
 
(C)y1=e3x, y2=e6x,y3=e9x
 
(D)y1=x,y2=3x,y3=x2

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統計： A(0), B(0), C(0), D(2), E(0) #1052338