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Trigonometry
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Cards (3)
Double Angle Identitites
Sin (2A) =
2sinAcosA
Tan (
2A
) =
2
t
a
n
A
/
1
−
t
a
n
2
A
2tanA/ 1-tan^2A
2
t
an
A
/1
−
t
a
n
2
A
Cos (2A) =
1
−
2
s
i
n
2
A
1-2sin^2A
1
−
2
s
i
n
2
A
=
2
c
o
s
2
A
−
1
2cos^2A-1
2
co
s
2
A
−
1
=
c
o
s
2
A
−
s
i
n
2
A
cos^2A - sin^2A
co
s
2
A
−
s
i
n
2
A
Addition Formulae
Sin (A±B)=
sinAcosB
± sinBcosA
Cos (
A+B
)= cosAcosB -sinAsinB
Cos (A-B)=
cosAcosB
+sinAsinB
Tan (A+B)= tanA + tanB/
1-tanAtanB
Tan (
A-B
)= tanA - tanB/ 1+tanAtanB
Trig
Identities
1
+
1+
1
+
c
o
t
2
A
=
cot^2A=
co
t
2
A
=
c
o
s
e
c
2
A
cosec^2A
cose
c
2
A
1
+
1+
1
+
t
a
n
2
A
=
tan^2A =
t
a
n
2
A
=
s
e
c
2
A
sec^2A
se
c
2
A
