Trig Flashcards
1
Q
§ is theta xx
A
.
2
Q
tan § =
A
sin§/cos§
3
Q
cosec §
A
1/sin§
4
Q
sec §
A
1 / cos§
5
Q
cot§
A
1 / tan§ = cos§/sin§
6
Q
cos(90-§)
A
sin§
7
Q
sin(90-§)
A
cos§
8
Q
Pythagorean identities
A
sin^2§ + cos^2§ = 1
1 + tan^2§ = sec^2§
1 + cot^2§ = cosec^2§
9
Q
sin(A+B)
A
sinAcosB + cosAsinB
10
Q
sin(A-B)
A
sinAcosB - cosAsinB
11
Q
cos(A+B)
A
cosAcosB - sinAsinB
12
Q
cos (A-B)
A
cosAcosB + sinAsinB
13
Q
tan(A+B)
A
(tanA+tanB) / (1-tanAtanB)
14
Q
tan(A-B)
A
(tanA-tanB) / (1+tanAtanB)
15
Q
sin2§
A
2sin§cos§
16
Q
cos2§
A
cos^2§ - sin^2§
2cos^2§ -1
1 - 2sin^2§
17
Q
tan2§
A
(2tan§) / (1 - tan^2§)
18
Q
Rearranged double angle
Sin^2§
A
1/2 - 1/2cos2§
19
Q
Rearranged double angle
cos^2§
A
1/2 + 1/2cos2§
20
Q
What is the harmonic identity and equations
A
Rcos(§ + a)
If Rcosa = a, Rsina = b
R=root(a^2 + b^2)
Tana = b/a
