From the given image, the task is to calculate two unknowns, $A$ and $B$, based on a trigonometric function machine that uses the cosine function. Here's the breakdown:

1. First input: $x$ results in the output $\cos(x)$.
2. Second input: $17^\circ$ results in the output $A$, implying $A = \cos(17^\circ)$.
3. Third input: $B$ results in $\cos(B) = 0.55$, so $B = \cos^{-1}(0.55)$.

Solution

1. Value of $A$: [