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d/dt d/dt -(0.7*cos(pi/2*t)+2*sqrt(1-((0.7*sin(pi/2*t)+0.25)/2)^2))
d/dt d/dt -(0.7*cos(pi/2*t)+2*sqrt(1-((0.7*sin(pi/2*t)+0.25)/2)^2))
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