Trig Identities Flashcards
1
Q
What is the sin double angle formula?
A
sin 2A = 2 sinA cosA
2
Q
What are the three cos double angle formulae?
A
cos 2A = cos^2 A - sin^2 A
cos 2A = 2cos^2 A - 1
cos 2A = 1 - 2sin^2 A
3
Q
What is the tan double angle formula?
A
tan 2A = (2 tan A) / (1 - tan^2 A)
4
Q
What are both A2 trig identities?
A
1 + tan²Θ = sec²Θ
1 + cot²Θ = cosec²Θ
