Great minds

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Across
  1. 2. American 16. president (has a memorial)
  2. 6. new movie
  3. 7. Wall -> cos(π/2)
  4. 8. Galápagos
Down
  1. 1. wall -> lim x→0 sin(x)/x
  2. 3. Famous danish
  3. 4. ..
  4. 5. Fruit