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Introducing Trigonometry

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30 º Hypotenuse Adjacent Opposite

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We use 3 functions Sine or SIN Cosine or COS Tangent or TAN

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Investigation To find a relationship between the 3 functions and the ratios of the lengths of a right angled triangle.

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TriangleHypotenuseOppositeO / HAngle xSin x 1 2 3 4 5

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TriangleHypotenuseOppositeO / HAngle xSin x 110 5 0.5 30 0.5 2 3 4 5

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53.2 º Hypotenuse Adjacent Opposite

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TriangleHypotenuseAdjacent A / HAngle xCos x 1 2 3 4 5

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Sin X = O / H Cos X= A / H Tan X = O / A

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