- Math helppp. Can anyone please explain me why the integration of (1/1+y^2) is tan inverse y ?

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Given f(x)=7x^2-3 and g(x)=1-2x find f(g(x)).? The least common multiple of 2 numbers is 60. One of the numbers is 7 less than the other. What are the numbers? Compre un auto , firme y dieron salida, ahora llaman y dicen que no debería llevar rines de aluminio, quieren que los regrese, ¿que procede? Solving using laplace transform? y" +3y' + 2y =t? initial conditions are y(0)=1, y'(0)=0? Determine whether the function f(x)=1/x is a one to one?