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Five PreCalc Groaners

Question: How do trig functions greet each other?

Answer: With a sine wave.

Question: What kind of angle never quits?

Answer: A triangle.

Question: What do you call articles of Arctic clothing that can be worn together?

Answer: Polar coordinates.

Question: What did the psychology student asking the question "Who am I?" have in common with the student trying to solve the matrix equation AX = A, where A and X are 2x2 matrices?

Answer: Both were searching for an identity.

Question: What do you call a prehistoric prison?

Answer: Concave.

Source: June Oliver. Algebra, Trig, and Pre-Calc Laughs. 2000