Studied by 17 peopleImportant trigonometric identities to know before the exam
sin²x + cos²x
1
tanx
sinx/cosx
sin2x
2sinxcosx
cos2x
cos²x - sin²x
2cos²x - 1
1 - 2sin²x
tan2x
2tanx/1 - tan²x
cosecx
1/sinx
secx
1/cosx
cotx
1/tanx
cosx/sinx
cosec²x
1 + cot²x
sec²x
tan²x + 1
sine rule
a/sin(A) = b/sin(B) = c/sin(C)
cosine rule
a2= b2 + c2- 2bc cosA b2
area of triangle formula
A = ½ ab sinC
radian arclength formul
l = rθ
sector area formula (radians)A =
Note
Flashcard