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OCR Maths
Trigonometry
Cosine Rule
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Cards (2)
Cosine Rule
:
a
2
=
a^{2}=
a
2
=
b
2
+
b^{2}+
b
2
+
c
2
−
2
(
b
)
(
c
)
(
c
o
s
A
)
c^{2}-2(b)(c)(cosA)
c
2
−
2
(
b
)
(
c
)
(
cos
A
)
The
Cosine Rule
is used when you have 3 sides and an
angle
.
