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Is optical molasses as slow as regular molasses? Cos^2 x + 2 cos x+1= 0 Solve the equation on the interval [0, 2pi).? Evaluate the following limits: lim from (x to 0+) integral (x to 1) 1/t dt? Show that the equation cos(x) − 3x = 1 has only one real root.? Find the equation of the line tangent to the graph of f(x) =x^4+2x^2 at the point where f (x)=1?