(cost - t sint)/(1+cost) d^x/dy^2 = d/dy (dx/dy) = d/dt (dx/dy) dt/dy = (d/dt (dx/dy))/(dy/dt) = -(sint(t sint+2) + t cos^2(t) + cost(t+sint))/(1+cost) at t = pi/2 that is -(pi/2 + 2)
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