To calculate \(\cos \left( \frac{4.8}{36} \right)\), we first simplify the fraction:
\[ \frac{4.8}{36} = \frac{4.8 \div 4.8}{36 \div 4.8} = \frac{1}{7.5} \approx 0.1333 \]
Now, we find the cosine of this value in radians. It's important to note that the output from calculators typically returns results in radians unless specified otherwise. However, since \(0.1333\) is relatively small, we can use a scientific calculator to find:
\[ \cos(0.1333) \approx 0.991 \]
Thus, \(\cos \left( \frac{4.8}{36} \right) \approx 0.991\).