IGCSE
EDEXCEL
Further Mathematics
10 Marks
QP-FurtherPureMath-201301-P2 · Question 5
Question (excerpt):
10 5 cos (A + B) = cos A cos B – sin A sin B (a) Use the above identity to show that 2 sin2 A = 1 – cos 2A (3) (b) Hence find the value of k such that sin2 2A = k (1 – cos 4A) (1) Figure 2 Figure 2 sh…
10 5 cos (A + B) = cos A cos B – sin A sin B (a) Use the above identity to show that 2 sin2 A = 1 – cos 2A (3) (b) Hence find the value of k such that sin2 2A = k (1 – cos 4A) (1) Figure 2 Figure 2 sh…
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