double angle theorems and the like Flashcards
1
Q
Sin (A+B)
A
sinAcosB + cosAsinB
2
Q
Cos(A+B)
A
cosAcosB - sinAsinB
3
Q
cos(A-B)
A
cosAcosB + sinAsinB
4
Q
sin(A-B)
A
sinAcosB - cosAsinB
5
Q
tan (A+B)
A
(tanA+tanB)/(1-tanAtanB)
6
Q
tan (A-B)
A
(tanA+tanB)/(1+tanAtanB)
7
Q
cos(2θ) (3 options)
A
cos^2(θ) - sin^2(θ)
1 - 2sin^2(θ)
2cos^2(θ) - 1
8
Q
sin(2θ)
A
2sin(θ)cos(θ)
9
Q
tan(2θ)
A
2tan(θ)/(1-tan^2(θ))
10
Q
sinAcosB + cosAsinB
A
Sin (A+B)
11
Q
cosAcosB - sinAsinB
A
Cos(A+B)
12
Q
cosAcosB + sinAsinB
A
cos(A-B)
13
Q
sinAcosB - cosAsinB
A
sin(A-B)
14
Q
(tanA+tanB)/(1-tanAtanB)
A
tan (A+B)
15
Q
(tanA+tanB)/(1+tanAtanB)
A
tan (A-B)
16
Q
cos^2(θ) - sin^2(θ)
A
cos(2θ)
17
Q
2sin(θ)cos(θ)
A
sin(2θ)
18
Q
2tan(θ)/(1-tan^2(θ))
A
tan(2θ)
19
Q
1 - 2sin^2(θ)
A
cos(2θ)
20
Q
2cos^2(θ) - 1
A
cos(2θ)
