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HMMT 2023 A3

  • Algebra and Number Theory
  • Answer

Suppose xx is a real number such that sin⁡(1+cos⁡2x+sin⁡4x)=1314\sin \left(1+\cos ^{2} x+\sin ^{4} x\right)=\frac{13}{14}. Compute cos⁡(1+sin⁡2x+cos⁡4x)\cos \left(1+\sin ^{2} x+\cos ^{4} x\right).

Dataset text NuminaMath olympiads. Quoted with source.

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-\frac{3 \sqrt{3}}{14}

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