曲线f(x)=sinx在点(π/2,1)的切线斜率k=?A.-1 B.0 C.1 D.π/2

问题描述:

曲线f(x)=sinx在点(π/2,1)的切线斜率k=?A.-1 B.0 C.1 D.π/2

∵f′(x)=cosx
∴k=f′(π/2)=cosπ/2=0
选B