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Sticky Note
If sin x = 15/17, then cos x = ?
  1. 8/17
  2. 15/17
  3. 17/8
  4. 1/17
Explanation
  • Use the identity: sin²x + cos²x = 1
  • Given: sin x = 15/17
  • So, cos x = √(1 − (15/17)²)
  • = √(1 − 225/289) = √(64/289) = 8/17

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