为什么导数开始S=f(t),但是ΔS≠f(Δt)?
1个回答
2018-07-01
展开全部
f(t)=(t-sint)/(t+sint)={(-t+sint)+2t}/(t+sint) = -1 + 2t/(t+sint) f ′(t) = { 2(t+sint) - 2t(1+cost) } / (t+sint)2 = 2(sint-tcost)/(t+sint)2 f ′(π/2) = 2(sinπ/2-π/2cosπ/2)/(π/2+sinπ/2)2 = 2(1-0)/(π/2+1)2 = 8/(π+2)2
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