- What isotope of Samarium is used to make cobalt magnets?

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Why is isobutyl propionate insoluble in aqueous solutions? I have a calculus problem to solve.
Use the limit definition of the derivative to find f'(x), where f(x) = x +1/x.
With steps please!? Differentiate the expression x^2y^5 with respect to x. (Use D for dy/dx).
How would I solve this implicit differentiation? Where are jaguars found? Select the atoms that are oxidized and reduced, respectively in the following reaction: HNO2 + I- -> NO + I3-?