Related Clues:

• Reciprocal of 12-Down
• Geometric function
• Number of calculations, not quite a contradiction in terms
• Opposite/hypoteneuse
• Trig function is recalled in element of solid geometry
• Placard, say, indicating a function
• Without; maths function
• Why 'e don't calculate this ratio?
• Report of board identifying pub function
• Wrong transcendental number function
• Cloister visited on and off is unable to function
• The number for which a given number is the logarithm
• It's between -1 and +1
• 0.5, for 30 degrees
• In a comparison of sides, wrong for runner to go round