Flashcards in Double Angle Formulae Deck (5)
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1
Q
cos2A = 3 equations
A
- cos2A = 1 - 2sin^2 A
- cos2A = cos^2 A - sin^2 A
- cos2A = 2cos^2 A - 1
2
Q
sin2A = 1 equation
A
sin2A = 2sinAcosA
3
Q
tan2A = 1 equation
it’s a fraction
A
tan2A = 2tanA / 1 - tan^2 A
4
Q
arc formulae
cot X?
cosec X
sec X
A
cot X = 1/tanX = cosX/sinX
cosec X = 1/sinX
secX = 1/cosX
5
Q
cosec^2 X =
sec^2 X =
A
cosec ^2 X = 1 + cot^2 X
cot ^2 X = 1 + tan^2 X