Mathematics · Oct / Nov 2025 · Paper 22 · Question 21

Correct sketch to go through (0, 1), (180, –1) and (360, 1) 1 0 360 –1 [2]

M1 for correct cos curve shape through (0, 1) or for almost correct sketch within tolerance but with an omission at either end or for almost correct sketch within tolerance but with incorrect curvature in one place only

150 and 210 [3]

B2 for one correct answer 3

or M1 for cos x = − or better 2

or B1 for 30 or –30 If M1, B1 or 0 scored, award

SC1 for two answers in range with a sum of 360