Proof, sum over pairs, sum of squares.

[STEP III 1993 Question 9 (Pure)]

Integration, approximation, Taylor series.

[STEP II 1991 Question 6 (Pure)]

Positive integers, fractions, C1.

[STEP II 1990 Question 6 (Pure)]

Modulus function, rational function, surds, trigonometry, trigonometric, integration.

[STEP I Specimen Question 9 (Pure)]