Cryptic crossword, Issue 14

Can you solve it?

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Cryptic #2, set by Humbug:

Across clues

  • 1. $\int2x\,\mathrm{d}x-x^2$, $6-6$, $6-10$, $1 – \text{O}$, $a\div h$. (6)
  • 4. Ape rambling by grand mountain. (4)
  • 7. How much is contained inside Far East?. (4)
  • 8. Fifty-one first, million second, six third, until eventually tending to this. (5)
  • 10. Limits of nonangle and torus can be folded up to make 3D shapes. (4)
  • 11. $\nabla\cdot(\text{kinetic energy}-y+t)$ is limitless. (9)
  • 14. Knight on the telephone regularly called after band. (6)
  • 15. Ball concealed by cusp, he realises. (6)
  • 17. Romeo, for example, coming to grips with TeX archive, initially loads editing box. (9)
  • 20. Boundary of zero-free area contains trivial origin‽ (4)
  • 22. A principle of astronomy leads people home again. (5)
  • 24. Contentless sudoku reworded to become irrational. (4)
  • 25. Head left, alternatively split in two. (4)
  • 26. Carla’s confused without direction. (6)

Down clues

  • 1. Disoriented duck halts magazine. (9)
  • 2. How quickly deep end fills up. (5)
  • 3. 50 and 5 dividing $3\times2.718$, adding $n$ makes a prime. (6)
  • 4. Endless DPhil leads to a solution of $x^2-x-1=0$. (3)
  • 5. Quadrilateral built from potassium, iodine and tellurium. (4)
  • 6. $x$, for example, starts after eleven seconds. (4)
  • 8. Function that can be split into smaller pieces using axes. (3)
  • 9. For example, $[0, 5)\in T$ precedes perturbed real around five?. (8)
  • 12. Calculates the area of misshapen triangle. (8)
  • 13. Dreamer in disarray produces rest. (9)
  • 16. Timeless tangles might be sharp?. (6)
  • 18. Third part of ratio mnemonic initially takes odd approach. (3)
  • 19. Is a bit of curve quality?. (5)
  • 20. Heading for Zambia Egypt result: nil-nil. (4)
  • 21. More complex than hyperbolic function. (4)
  • 23. Shared divisor ends much algebraic faff. (1,1,1)

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