For what values of a does the graph of f(x) - * + 25 + 2 sin (x) have a horizontal tangent? O x = (2n + 1)7+- -, n - integer O x = (2n)7 -n = integer O x = (2n +17- - 6: n - integer O x = (2n)7 -;n - integeron 4 If we need to approximate