(Y2:7) Trigonometry and modelling
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4 Terms
1
What are the compound formulae
sin(A±B) = sinA cosB ± cosA sinB
cos(A±B) = cosA cosB ∓ sinA sinB
tan(A±B) = (tanA ±tanB)/(1∓tanA×tanB)
2
What are the double-angle formulae
sin2A = 2sinAcosA
cos2A = cos²A-sin²A
=2cos²A-1
=1-2sin²A
tan2A =(2tanA)/(1=tan²A)
3
H
T
4
H
T
Note 
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