The numerator must be zero:

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• \[ C'(t) = \frac{k(1 - t^2)}{(t^2 + 1)^2} \]
• Set \(C'(t) = 0\):
• \[ \frac{k(1 - t^2)}{(t^2 + 1)^2} = 0 \]
• \[ 1 - t^2 = 0 \]
• \[ t^2 = 1 \]
• \[ t = \pm 1 \]

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