MATHS PUZZLE

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Across
  1. 3. lines coincide
  2. 5. Sum up to 90
  3. 7. Cos θ /sin θ
  4. 8. sequence added by a fixed number
  5. 9. 3angle measure
Down
  1. 1. opposite by adjacent
  2. 2. sum upto 180
  3. 4. Nature of roots
  4. 6. Right angle triangle
  5. 10. Cosine squared + sine squared