A.y=sin2x,y′=cos2x                        B.y=sinx²,y′=2xcosx²

C.y=cosx²,y′=2xcosx                     D.y=cos,y′=-sin

A.                     B.

C.                     D.-

A.y=uⁿ,u=cosxⁿ                                    B.y=t,t=cosⁿx

C.y=tⁿ,t=cosx                                       D.y=cost,t=xⁿ

A.a                 B.±a                C.-a               D.a²

(1)求f′();

(2)若f′(x₀)=2,求x₀.

(1)与y=6x+3平行的切线方程;

(2)斜率最小的切线方程.

在y=2+sinx(0＜x＜π)上取点M,使过点M的切线与直线y=x平行,则M点坐标为____________________.

y=在点P(,)处的切线斜率为__________.