which of the following is defined a) tan 90 b ) cot 0 c ) cosec 90 d ) sec 90

tan 90 = sin 90cos 90 = 10 is not defined

cot 0 = cos 0sin 0 = 10 is not defined

cosec 90 = 1sin 90 = 11 = 1

sec 90 = 1cos 90 = 10 is not defined

Thus, only cosec 90 is defined.

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