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Theorem:
If ABC is a triangle with sides a = BC, b = CA, c = AB, then prove that
where 2s = a + b + c.
Proof:
2s = a + b + c
Half-Angle Formulae
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Trigonometry (Continued)
- Introduction
- Co-terminal Angles
- Theorem 1
- Theorem 2
- Theorem 3
- Theorem 4
- Sine Formula (Sine Rule)
- Cosine Formula (Cosine Rule)
- Projection Formula
- Napier's Analogy
- Area of a triangle
- Hero's Formula
- Half-Angle Formulae
- Solution of triangles
- Heights and Distances
- Inverse Trigonometric Functions
- Hyperbolic Function
- Inverse Hyperbolic functions
- Summary
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