imo class 12 determinants

Evaluate: |cos15° sin15°; sin75° cos75°|

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#IMO#Class 12#Mathematics#Determinants#mathematical-reasoning

Evaluate: |cos15° sin15°; sin75° cos75°|

  • A. 0
  • B. 1
  • C. √3/2
  • D. 1/2

Answer: A) 0

Explanation: sin75° = cos15°, cos75° = sin15°. So rows are identical, determinant = 0.

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