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Question

Which of the following complementary trigonometric ratios are not defined at 0°?
  1. Cot θ
  2. Cos θ
  3. Cosec θ
  4. Sec θ


Solution

The correct options are
A Cot θ
C Cosec θ
we know that, 
Cot 0°=Not definedCos 0°=1Cosec 0°=Not definedSec 0°=1

So,Cot θ and Cosec θ are the two complementary trigonometric ratios which are not defined at 0°. 

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