In this reaction sequence, phenol (C\(_6\)H\(_6\)O) reacts with NaOH to form sodium phenoxide (Y). The sodium phenoxide then reacts with CO\(_2\) and undergoes acidification to form salicylic acid (Z).
Thus, the correct answer is (E).
Let \( I = \int_{-\frac{\pi}{4}}^{\frac{\pi}{4}} \frac{\tan^2 x}{1+5^x} \, dx \). Then: