# How to Use the Cosine Rule?

Use the Cosine Rule to find out the three anglesThe Cosine rule is a very commonly used rule in trigonometry. It can be used to investigate the properties of non-right triangles. The Pythagorean Th...
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## How to: Subtraction of Cosine?

The cosine of an angle on a right triangle is the ratio of the adjacent leg to the hypotenuse. The cosine of one angle subtracted from another can be determined by means of a very simple formula. T...
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## How to Simplify Sine & Cosine?

In the 14th century, Arabian mathematicians invented sine and cosine to describe the ratios of side lengths in right triangles. In the centuries that followed, it was found that sines and cosines w...
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## How to Find a Cosine on a Calculator?

Using cosine on a calculator saves a lot of time compared to looking it up in a table, which people did before calculators. Cosine comes from a part of mathematics called trigonometry, which deals ...
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## How to Solve Sine & Cosine in Triangles?

A right triangle consists of one 90-degree angle, two shorter sides and a longer, slanted slide called the hypotenuse. The trigonometric functions sine, cosine and tangent are defined based on a ri...
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