Higher June 2023 Paper 2R Q26

EdexcelHigherCurrent spec3 marksAdvanced Trigonometry

26 Here is a sketch of the curve with equation \(\;y = a\cos bx^\circ + c\;\) where \(\;-90 \leqslant x \leqslant 450\)

Graph of a cosine curve for x from −90 to 450 with maximum value 3 at x = 0, 120, 240 and 360 and minimum value −1 at x = −60, 60, 180, 300 and 420

Find the value of \(a\), the value of \(b\) and the value of \(c\)

(3)

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