double angle formulae Flashcards
1
Q
sin 2A
A
2 sinAcosA
2
Q
cos 2A
A
cos^2(A) - sin^2(A)
2cos^2(A) - 1
1 - 2sin^2(A)
3
Q
tan 2A
A
2 tan A/1 - tan^2(A)
4
Q
sin A (extended)
A
2 sin A/2 cos A/2
5
Q
sin 4A
A
2 sin2Acos2A
