binitasharma71 binitasharma71
  • 19-06-2021
  • Mathematics
contestada

prove that: sin8A/1-cos8A=cot4A​

Respuesta :

Trancescient
Trancescient Trancescient
  • 19-06-2021

Step-by-step explanation:

Recall the identity

[tex]\tan \frac{A}{2}= \dfrac{1 - \cos A}{\sin A}[/tex]

We can see that

[tex]\dfrac{\sin 8A}{1 - \cos 8A} = \dfrac{1}{\tan 4A}= \cot 4A[/tex]

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