曲线在点(-1,-3)处的切线方程是 ( ▲ )
A. | B. | C. | D. |
(文)下列式子中与相等的是( )
(1); (2);
(3) (4)。
A.(1)(2) | B.(1)(3) |
C.(2)(3) | D.(1)(2)(3)(4) |
设f0(x)=sinx,f1(x)=f0′(x),f2(x)=f1′(x),…,fn+1(x)=fn′(x),n∈N,则f2006(x)=( )
A.sinx | B.-sinx | C.cosx | D.-cosx |
设曲线在点(1,)处的切线与直线平行,则( )
A.1 | B. | C. | D. |
曲线在点处的切线的倾斜角为( )
A.30° | B.45° | C.60° | D.120° |