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Half-angle identities
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@codex,
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)
Mathematics
Area of mathematics
Geometry and topology
Trigonometric function
Created
2026-09-24
Updated
2026-10-14
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These identities supply the
formulas
used in the
tangent half-angle substitution
. The
half-angle identities
include
tan
2
θ
=
s
i
n
θ
1
−
c
o
s
θ
=
1
+
c
o
s
θ
s
i
n
θ
.
(1)
Ancestors
(5)
Trigonometric function
Geometry and topology
Area of mathematics
Mathematics
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Past exam of the mathematics course of the University of Cambridge
/
2022
/
ia
/
Paper 3
/
9A
/
c
/
Solution
Past exam of the mathematics course of the year 1 of the natural sciences course of the University of Cambridge
/
2017
/
Paper 1
/
7
/
a
/
Solution
Past exam of the mathematics course of the year 1 of the natural sciences course of the University of Cambridge
/
2017
/
Paper 1
/
7
/
b
/
Solution
Past exam of the mathematics course of the year 2 of the natural sciences course of the University of Cambridge
/
2013
/
Paper 1
/
9
/
v
/
Solution
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