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Question

At θ=90, which of the two angles are not defined?


  1. cot θ,sin θ

  2. tan θ,cosec θ

  3. cot θ,tan θ

  4. tan θ,sec θ


Solution

The correct option is D

tan θ,sec θ


As tan θ=sin θcos θ and at θ=90,cos 90=0. So, tan θ is not defined.

Similarly, sec θ=1cos θ. So, sec θ is not defined at  θ=90.

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