Step 1: Identify the yeast used in bread-making.
S. cerevisiae, commonly known as baker's yeast, is used in bread-making as it ferments sugars to produce carbon dioxide, causing the bread to rise.
Step 2: Analyze the options.
Aspergillus is a genus of molds, not used for bread-making.
Streptobacillus is a genus of bacteria, not used in baking.
S.octosporus is not a yeast species used in bread-making.
Conclusion: The correct answer is (A) S. cerevisiae.
Let the function $ f(x) $ be defined as follows: $$ f(x) = \begin{cases} (1 + | \sin x |)^{\frac{a}{|\sin x|}}, & -\frac{\pi}{6}<x<0 \\b, & x = 0 \\ \frac{\tan 2x}{\tan 3x}, & 0<x<\frac{\pi}{6} \end{cases} $$ Then the values of $ a $ and $ b $ are: