Which of the following is not defined?

sin 90^{\circ}

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tan 0^{\circ}

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cot 90^{\circ}

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c o s e c 0^{\circ}

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Solution

The correct option is C $c o s e c 0^{\circ}$
$c o s e c 0^{o} = \frac{1}{sin 0^{o}} = \frac{1}{0}$ is not defined.
Hence, the answer is $c o s e c 0 ° .$

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