Related Clues:

• ___ die
• Function in 39-Down
• Reciprocal of 12-Down
• Geometric function
• Opposite/hypoteneuse
• Placard, say, indicating a function
• Without; maths function
• Report of board identifying pub function
• Wrong transcendental number function
• Put energy into inadequate triangular relationship
• Line of ascent that's fixed
• It's between -1 and +1
• 0.5, for 30 degrees
• It has a reciprocal function
• Reciprocal of cosine