dy/dt:dx/dt=dy/dt
dx/dt=cost-t*sint
dy/dt=-2t
dy/dx=-2t/(cost-t*sint)
dy/dx при t=0 тоже равна 0
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dy/dt:dx/dt=dy/dt
dx/dt=cost-t*sint
dy/dt=-2t
dy/dx=-2t/(cost-t*sint)
dy/dx при t=0 тоже равна 0