To determine which of the given trigonometric ratios has a value that is undefined, we can evaluate each ratio:
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csc π: The cosecant function is defined as \( csc(x) = \frac{1}{sin(x)} \). Since \( sin(π) = 0 \), \( csc(π) = \frac{1}{0} \) is undefined.
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sec π: The secant function is defined as \( sec(x) = \frac{1}{cos(x)} \). Since \( cos(π) = -1 \), \( sec(π) = \frac{1}{-1} = -1 \), which is defined.
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sin π: \( sin(π) = 0 \), which is defined.
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tan π: The tangent function is defined as \( tan(x) = \frac{sin(x)}{cos(x)} \). Since \( sin(π) = 0 \) and \( cos(π) = -1 \), \( tan(π) = \frac{0}{-1} = 0 \), which is defined.
Thus, the only trigonometric ratio from the list that is undefined is:
csc π.