Which of the following complementary trigonometric ratios are not defined at 0°?

C o t θ

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C o s θ

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C o s e c θ

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S e c θ

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Solution

The correct options are
A $C o t θ$
C $C o s e c θ$
we know that,
$C o t 0 ° = N o t d e f i n e d C o s 0 ° = 1 C o s e c 0 ° = N o t d e f i n e d S e c 0 ° = 1$

$S o, C o t θ a n d C o s e c θ$ are the two complementary trigonometric ratios which are not defined at 0°.

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