§2求导法则 (2)f(x)=x+2xsnx,f(0)=1,f(x)=-1 cos r (3)f(x)= f(1)= 1 4√2 2.求下列函数的导数 (1)y=3x2+2 (2) (3)y =x+nr (4)y= 2 (5)y=xlog (6)y=ecos (7)y=(x2+1)(3x-1)(1-x3)(8)y tanT (9)y= 1- cosz -Inx (11)y=(vr+1)arctan inx cosr 解(1) 6 ()y=(2+x+)-(2+2n)=x2+4+ (3)y=nxx-1+n=n(xn-1+1)(4)y 1m+1 5)y=3xx+m,=3x3kgx+品 (6)y=ecosI-esinr e(oos..r) (7)y=-3x6+x5-3x4+4x3-x2+3x-1 y=-18x5+5x4-12x3+12x2-2x+3 (8)y=2sec'x-tanr (9)y=(1-cos.x)2 1-cosx -sinr 1-Inx)+-(1+hnz (10)y (1-lnx)2 2