Final answer:
The function f(x) = 7 sin(x) + sin(2x) has been presented for x in the interval [0, 2π]. Specific values cannot be provided without a specific 'n'; however, when n is a multiple of π, we can use known sine values to find f(n).
Step-by-step explanation:
The function given is f(x) = 7 sin(x) + sin(2x) for x in the interval [0, 2π]. To find the value of f at x = n, where n is a positive integer, we can use the known values of sine at specific angles. However, the task seems to be incomplete as the specific value of 'n' is not provided. In general, if n is a multiple of π, such as 1π, 2π, etc., the value can be determined using the known sine values for these angles.
For example, if n = π, we find f(π) = 7 sin(π) + sin(2π). Since sin(π) = 0 and sin(2π) = 0, f(π) = 0.