∵f′(x)=cosx
∴k=f′(π/2)=cosπ/2=0
选B
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
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
数学人气:518 ℃时间:2020-07-04 10:37:19
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