- Is feldspar harder than calcite?

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Integral cos(ln x) dx? If you could travel annywere you want were would you go? Do you know how to solve this question about Discrete Mathematics? a,b,c,d ∈R. solve : a + bcd = b + cda = c + dab = d + abc = 2.? Why is the value obtained for the density of a metal likely to have a larger percentage error than the density found for a liquid?