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What is  equal to?

  1. tanA
  2. cotA
  3. 2tanA
  4. 2cotA

Answer (Detailed Solution Below)

Option 4 : 2cotA
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Detailed Solution

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Concept:

cos 2A = cos2 A – sin2 A

sin 2A = 2 sin A × cos A

Calculation:

As we know that, cos 2A = cos2 A – sin2 A

As we know that, sin 2A = 2 sin A × cos A

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