1-cos2A is equal to:

1-cos 2A is equal to?

  1. sin 2A
  2. tab 2A
  3. 1-sin 2A
  4. sec 2A

The correct option is i. sin 2A

This is obtained from the trigonometry identities:

sin 2A + cos 2A = 1

1-cos 2A = sin 2A

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