1
Q
tanx =
A
cosx
2
Q
secx =
A
cosx
3
Q
cosecx =
A
sinx
4
Q
cotx =
A
1 cosx
—– OR ——
tanx sinx
5
Q
cos^2x + sin^2x =
A
1
6
Q
1+tan^2x=
A
sec^2x
7
Q
1+cot^2x=
A
cosec^2x
8
Q
sin(A+B)=
A
sinAcosB+cosAsinB
9
Q
sin(A-B)=
A
sinAcosB-cosAsinB
10
Q
cos(A+B)=
A
cosAcosB-sinAsinB
11
Q
cos(A-B)=
A
cosAcosB+sinAsinB
12
Q
tan(A+B)=
A
1-tanAtanB
13
Q
tan(A-B)=
A
1+tanAtanB
14
Q
sin2x=
A
2sinxcosx
15
Q
cos2x=
A
cos^2x-sin^2x
OR
2cos^2x-1
OR
1-2sin^2x
16
Q
tan2x=
A
1-tan^2x
GCE A2 Edexcel Maths
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