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Cosine for OCR A-level Maths

Cosine

This page covers the following topics:

1. Cosine
2. Cosine graphs and transformations

Cosine of an angle is a ratio between the side adjacent to the angle and the hypotenuse of a triangle.

Cosine

The diagram shows a cosine graph.

Cosine graphs and transformations

1

Find a if cosB = 0.9 and c = 40.

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36

Find a if cosB = 0.9 and c = 40.

2

Find a if cosB = 0.3 and c = 20 cm.

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6 cm

Find a if cosB = 0.3 and c = 20 cm.

3

Write down the coordinates of point B on the cosine graph.

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(270º, 0)

Write down the coordinates of point B on the cosine graph.

4

Find b if cosA = 0.5 and c = 10.8.

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5.4

Find b if cosA = 0.5 and c = 10.8.

5

Provide the point at which a cosine graph crosses the y axis.

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(0º, 1)

Provide the point at which a cosine graph crosses the y axis.

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