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dx/dt = cost, dy/dt = 2sin2t, dy/dx = (dy/差坦好dt)/(dx/dt) = 4sint
d^2y/dx^2 = d(dy/虚铅dx)/dx = [d(dy/dx)/dt]/(dx/dt) = -4cost/信胡cost = -4
d^2y/dx^2 = d(dy/虚铅dx)/dx = [d(dy/dx)/dt]/(dx/dt) = -4cost/信胡cost = -4
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(2)
x=∫历袜(0->t) cosu du
dx/dt = cost
y=∫(0->2t) sinu du
dy/dt =2sin(2t)
dy/dx = (dy/dt)/(dx/dt) = 2sin(2t)/cost = 4sint
d^y/dx^2
=d/dx ( dy/dx)
=d/或枣dt ( dy/dx) /衫烂拆 (dx/dt)
=d/dt ( 4sint) / cost
=4cost/cost
=4
x=∫历袜(0->t) cosu du
dx/dt = cost
y=∫(0->2t) sinu du
dy/dt =2sin(2t)
dy/dx = (dy/dt)/(dx/dt) = 2sin(2t)/cost = 4sint
d^y/dx^2
=d/dx ( dy/dx)
=d/或枣dt ( dy/dx) /衫烂拆 (dx/dt)
=d/dt ( 4sint) / cost
=4cost/cost
=4
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