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XCosX議擬方頁謹富?奕担麻議椿?

盾:(xcosx)'=(x)'cosx+x(cosx)'=cosx-xsinx

泌夕

y=xsinx+cosx y'=sinx+xcosx-sinx=xcosx

y=cos(x/3) y'=[cos(x/3)]',(x/3)' =-⅓sin(x/3)

y=x³cosx y'=3x²cosx+x³(cosx)' =3x²cosx-x³sinx 僉B

y=(cosx)^2,夸y'=2cosx*(cosx)'=-2cosx*sinx=-sin2x 泌惚頁y=cos(x^2),夸y'=-sin(x^2)*(x^2)'=-2xsin(x^2)

y'=2x(-sinx)

6sinxcos²x-3sin³x

芝誼寡追

y'=(-xsinx-cosx)/x²

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