What I got -sin (z) / -8cos (z)*sin (z) simplifies to 1/8cos (z) I don't think I'm right...
dx/dt = -2sinz dy/dx = -1/2 cotz d^2y/dx^2 = [d/dt(dy/dx)]/(dx/dt) = -1/2 csc^2(z) / -2sinz = -1/4 csc^3(z) too bad you didn't show any of your work...
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