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Find the equation of the line tangent to the graph of f(x) =x^4+2x^2 at the point where f (x)=1? Platinum has atomic radius 139 pm and crystallizes with a face-centered cubic unit cell. Calculate its density.? Cual es el acomodo de electrones que corresponde al atomo de cripton? If f(x)=ln(x)+arctan(x), find the derivative of f^(-1)(2) (inverse of f(x))? Evaluate the following limits: lim from (x to 0+) integral (x to 1) 1/t dt?