Trig Formulas/Identities Flashcards
1
Q
(A^3)-(B^3)?
A
= (A-B)(A^2+AB+B^2)
2
Q
(A^3)+(B^3)?
A
=(a + b) (a^2 + b^2 - ab)
3
Q
pythag identity
A
sin^2x+cos^2x=1
4
Q
sin (A+B)
A
sinAcosB+cosAsinB
5
Q
sin(A-B)
A
sinAcosB-cosAsinB
6
Q
cos(A+B)
A
cosAcosB-sinAsinB
7
Q
cos(A-B)
A
cosAcosB+sinAsinB
8
Q
tan(A+B)
A
tanA+tanB/1-tanA(tanB)
9
Q
tan(A-B)
A
tanA-tanB/1+tanA(tanB)
10
Q
distance formula
A
square root of (x2-x1)^2 + (y2-y1)^2
11
Q
arc length
A
radius*central angle
12
Q
arc area
A
1/2r^2central angle
13
Q
how do you find the period of sec csc
A
graph sine or cosine, go from there!
14
Q
hertz/frequency calculations
A
frequency=1/period
15
Q
pthag identity sec
A
1+tan^2x=sec^2x
