Given $\cos t=\frac{4 \sqrt{5}}{9}$, evaluate the indicated functions. Write your answer as a simplified fraction, if necessary. Part: 0 / 3 Part 1 of 3 (a) $\cos (-t)=\square$

Step 1 ：To find the value of \(\cos (-t)\), we need to remember that the cosine function is an even function, which means that \(\cos (-t) = \cos (t)\).

Step 2 ：Since we are given that \(\cos t=\frac{4 \sqrt{5}}{9}\), we can directly use this value for \(\cos (-t)\).

Step 3 ：\(\cos (-t) = \frac{4 \sqrt{5}}{9}\)

Step 4 ：Final Answer: \(\boxed{\frac{4 \sqrt{5}}{9}}\)