请问11题怎么做？
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x = cost, dx/dt = -sint
y = 2t-sin2t, dy/dx = 2-2cos2t = 2(1-cos2t) = 4(sint)^2
dy/dx = (dy/dt)/(dx/dt) = -4sint
d^2y/dx^2 = d(dy/dx)/dx = [d(dy/dx)/dt]/(dx/dt)
= -4cost/(-sint) = 4cott
y = 2t-sin2t, dy/dx = 2-2cos2t = 2(1-cos2t) = 4(sint)^2
dy/dx = (dy/dt)/(dx/dt) = -4sint
d^2y/dx^2 = d(dy/dx)/dx = [d(dy/dx)/dt]/(dx/dt)
= -4cost/(-sint) = 4cott
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