作业帮微积分题请解答（详解）A particle moves along the y-axis so that its position ar time 0<=t<=20 is given by y(t)=5t-t^2/3.At what time does the particle change direcition?(seconds)if f(x)=sec(3x),then f ' (3派/4)=? (派:3.14,但
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微积分题请解答（详解）A particle moves along the y-axis so that its position ar time 0<=t<=20 is given by y(t)=5t-t^2/3.At what time does the particle change direcition?(seconds)if f(x)=sec(3x),then f ' (3派/4)=? (派:3.14,但
微积分题请解答（详解）
A particle moves along the y-axis so that its position ar time 0<=t<=20 is given by y(t)=5t-t^2/3.At what time does the particle change direcition?(seconds)
if f(x)=sec(3x),then f ' (3派/4)=? (派:3.14,但不带入3.14)
if a curve is defined by f(x)=1-xcos x,an equation of the normal to the curve at (派/w,1) is y=?(A. 派x/2+派/2 B.派x/2+(派/2)^2 C. 派x/2-2 D.-派x/2+2 E.-派x/2-2)
If a function is given by f(x)=(x+3)/(x^2-1),what is the instantaneous rate of change of the function at x+3?(A.7/16 B.-7/16 C.11/16 D.-11/16 E.1/6)
微积分题请解答（详解）A particle moves along the y-axis so that its position ar time 0<=t<=20 is given by y(t)=5t-t^2/3.At what time does the particle change direcition?(seconds)if f(x)=sec(3x),then f ' (3派/4)=? (派:3.14,但
f(x)=sec(3x),f'(x)=3sec^2 (3x)tan(3x)