The trigonometric ratios sine, cosine and tangent are used to calculate angles and sides in right angled triangles. We are now going to extend trigonometry beyond right angled triangles and use it ...
The sides of right-angled triangles are labelled opposite, hypotenuse and adjacent. Trigonometry explores ... divided by the hypotenuse is called the cosine of the angle, and is abbreviated ...
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High school students who came up with 'impossible' proof of Pythagorean theorem discover 9 more solutions to the problemBut Jackson and Johnson managed to prove the theorem using a result of trigonometry called the Law ... and cosine are ratios ...
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