trigo formulasidentities Flashcards
1
Q
cos(x+y)=
A
cosxcosy-sinxsiny
2
Q
cos(x-y)=
A
cosxcosy+sinxsiny
3
Q
cos(pi/2 - x)=
A
sinx
4
Q
cos(pi/2 +x)=
A
-sinx
5
Q
sin(pi/2-x)=
A
cosx
6
Q
sin (pi/2 +x )=
A
cosx
7
Q
sin(x+y)=
A
sinxcosy+cosxsiny
8
Q
sin(x-y)=
A
sinxcosy-cosxsiny
9
Q
cos(pi-x)=
A
-cosx
10
Q
sin(pi-x)
A
sinx
11
Q
cos(pi+x)
A
-cosx
12
Q
sin(pi+x)
A
-sinx
13
Q
cos(2pi-x)
A
cosx
14
Q
sin(2pi-x)
A
-sinx
15
Q
tan(x+y)
A
tanx+tany/ 1-tanxtany
