Topic 5 Flashcards
1
Q
What is sin(2A)
A
2(sinAcosA)
2
Q
What is cos(2A)
A
cos^2(A)-sin^2(A)
3
Q
What is the other two variants if cos(2A)
A
2cos^2A-1
1-2sin^2A
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-tanAtanB
9
Q
tan(A-B)
A
(tanA-tanB)/1+tanAtanB
10
Q
What is tan(2A)
A
(2tanA)/1-tan^2A
11
Q
Identity with sin^2 and cos^2
A
sin^2x + cos^2x = 1
12
Q
Identity with tan^2x and sec^2x
A
tan^2x + 1 = sec^2x
13
Q
Identity with cot^2x cosec^2x
A
1 + cot^2x = cosec^2x
14
Q
What is the small angle approximation for cos θ
A
1 - (θ^2)/2
15
Q
What is the small angle approximation for sin θ
A
θ
