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cos
Double Angle Trig Identities
sin
(
2
θ
)
=
2
⋅
sin
(
θ
)
⋅
cos
(
θ
)
\sin(2\theta) = 2 \cdot \sin(\theta) \cdot \cos(\theta)
sin
(
2
θ
)
=
2
⋅
sin
(
θ
)
⋅
cos
(
θ
)
Trig Angle Sum/Difference Identities
sin
(
a
±
b
)
=
sin
(
a
)
cos
(
b
)
±
cos
(
a
)
sin
(
b
)
\scriptsize \sin(a \pm b) = \sin(a) \cos(b) \pm \cos(a) \sin(b)
sin
(
a
±
b
)
=
sin
(
a
)
cos
(
b
)
±
cos
(
a
)
sin
(
b
)
Cosine Law
c
2
=
a
2
+
b
2
−
2
⋅
a
⋅
b
⋅
cos
(
θ
)
c^2 = a^2 + b^2 - 2 \cdot a \cdot b \cdot \cos(\theta)
c
2
=
a
2
+
b
2
−
2
⋅
a
⋅
b
⋅
cos
(
θ
)