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How can I make one switch turn on two different electronic circuits simultaneously? Platinum has atomic radius 139 pm and crystallizes with a face-centered cubic unit cell. Calculate its density.? -8 = z + 3z? If the second derivative g(a) = 0, then y = g(x) has an inflection point at x = a. True or false? Find the equation of the line tangent to the graph of f(x) =x^4+2x^2 at the point where f (x)=1?