問題一覧
1
sin(90-θ)=
cosθ
2
cos(90-θ)=
sinθ
3
tan(90-θ)=
1/tanθ
4
sin(180-θ)
sinθ
5
cos(180-θ)
-cosθ
6
tan(180-θ)
-tanθ
7
sin(-θ)
-sinθ
8
cos(-θ)
cosθ
9
tan(-θ)
-tanθ
10
sin(a+b)=
sinacosb+cosasinb
11
cos(a+b)=
cosacosb-sinasinb
12
tan(a+b)=
tana+tanb/1-tanatanb
13
sin2a=
2sinacosa
14
cos2a=
2cos^2a-1
15
tan2a=
2tana/1-tan^2a
16
sin3a=
-4sin^3a+3sina
17
cos3a=
4cos^3a-3cosa
18
sin^2(a/2)=
1-cos2a/2
19
cos^2(a/2)=
1+cos2a/2
20
tan^2(a/2)=
1-cos2a/1+cos2a
21
asinθ+bcosθ=
√a^2+b^2 sin(θ+a)