23 Maths -- Trigonometry

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The Half-angle Formula

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For Cosine values,
The other results of cosine values in Half-angle formula follow the same process.

For Sine values

The other results of sine value in Half-angle formula follow the same process.

For Tangent values

The other results of tangent values in Half-angle formula follow the same process.

More notes on Trigonometry

Introduction to Trigonometry

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Trigonometric Functions

Solutions to Trigonometric Equations

Theorem 1: The Sine Law

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Theorem 2: The Sine Law in terms of Circum-Radius R

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The Cosine Law

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The Sine Law

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The Cosine Law - Proof

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The Sine Law in terms of Circum-Radius

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