[Python] Declaring a new math function using NumPy

A simple issue:

Why does

import numpy as np
f = np.sin(x)
print(f(0.3))


return an error; whereas

import numpy as np
print(np.sin(0.3))


does not?

Suppose, for instance I wanted to store f as:

f(x) = sin(x) + 2*sin(3.4*x)


How would I go about this?

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