Chapter 7.5- Sum and Difference Identities Flashcards
1
Q
What is the identity for sinxcosy + cosxsiny
A
sin(x+y)
2
Q
What is the identity for sin(x+y)
A
sinxcosy + cosxsiny
3
Q
What is the identity for sinxcosy - cosxsiny
A
sin(x-y)
4
Q
What is the identity for sin(x-y)
A
sinxcosy - cosxsiny
5
Q
What is the identity for cosxcosy - sinxsiny
A
cos(x+y)
6
Q
What is the identity for cosxcosy + sinxsiny
A
cos(x-y)
7
Q
What is the identity for cos(x+y)
A
cosxcosy - sinxsiny
8
Q
What is the identity for cos(x-y)
A
cosxcosy + sinxsiny
9
Q
What is the identity for sin(2x)
A
2sinxcosx
10
Q
What are the identities for cos(2x)
A
cos2x - sin2x
2cos2x - 1
1 - 2sin2x
11
Q
What is the identity for 2sinxcosx
A
sin(2x)
12
Q
What is the identity for cos2x-sin2x
A
cos(2x)
13
Q
What is the identity for 1 - 2sin2x
A
cos(2x)
14
Q
What is the identity for 2cos2x-1
A
cos(2x)
15
Q
What is the identity for tan(2x)
A
_ 2tanx _
1 - tan2x
