8. (15%) \( X \sim N(0,1) \) and \( Y \sim N(0,1) \), \( X \) and \( Y \) are independent. Please derive the probability density functions of \( W = X / Y \).
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8. (15%) \( X \sim N(0,1) \) and \( Y \sim N(0,1) \), \( X \) and \( Y \) are independent. Please derive the probability density functions of \( W = X / Y \).