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
答
∵f′(x)=cosx
∴k=f′(π/2)=cosπ/2=0
选B