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##### Introducing Trigonometry

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**Opposite**Hypotenuse 30º Adjacent**We use 3 functions**• Sine or SIN • Cosine or COS • Tangent or TAN**Investigation**• To find a relationship between the 3 functions and the ratios of the lengths of a right angled triangle.**Opposite**Adjacent Hypotenuse 53.2º**Sin X = O / H**• Cos X= A / H • Tan X = O / A