Trigonometric Identities Flashcards
1
Q
1 + tan²x =
A
sec²x
2
Q
1 + cot²x =
A
cosec²x
3
Q
sin2x =
A
2sinxcosx
4
Q
cos2x =
A
= cos²x - sin²x
= 2cos²x - 1
= 1 - 2sin²x
5
Q
tan2x =
A
(2tanx) / (1 - tan²x)
6
Q
2sinAcosB =
A
sin(A+B) + sin(A-B)
7
Q
2cosAsinB =
A
sin(A+B) - sin(A-B)
8
Q
2sinAsinB =
A
-cos(A+B) + cos(A-B)
9
Q
2cosAcosB =
A
cos(A+B) + cos(A-B)
