https://www.mathsisfun.com/algebra/trigcosinelaw.html
The Law of Cosines. The Law of Cosines (also called the Cosine Rule) is very useful for solving triangles: It works for any triangle:

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http://www.bbc.co.uk/schools/gcsebitesize/maths/geometry/furthertrigonometryhirev2.shtml
For a triangle with sides a,b and c and angles A, B and C the cosine can be written as: a 2 = b 2 + c 2  2bc A; or; b 2 = a 2 + c 2  2ac B; or; c 2 = a ...

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http://www.youtube.com/watch?v=20yldGMZ3M4
"Cosine Rule" "Trigonometry" "Maths" "How to use the cosine rule" "trig functions" "Cosine" "Sine" "Tan" "Trig" "Trig help" "Finding the length" Cosine ...

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http://www.nzmaths.co.nz/resource/cosinerule
This unit concentrates on the Cosine and its application to solving triangles, that is, to finding the unknown sides and angles of triangles.

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https://www.math10.com/en/geometry/sincosrule.html
Cosine(Cos) Let's a(the length of BC), b(the length of CA), c(the length of AB) are the lengths of the sides of a triangle ABC. Cosine formulas are:

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http://www.ymaths.co.uk/trisincosrl.htm
Sine and Cosine . Sine and cosine can be used on any triangle, not just rightangled triangles. But as there is no right angle, there is no hypotenuse, so ...

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http://www.bbc.co.uk/bitesize/standard/maths_ii/trigonometry/sin_cosine_area_triangle/revision/1/
A BBC Bitesize secondary school revision resource for Standard Grade Maths II about trigonometry: sine rule, cosine rule, area of a triangle.

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http://www.youtube.com/watch?v=I8LI7wPSvNI
This video is a tutorial on Sine and Cosine Rule. Please make yourself a revision card while watching this and attempt my examples. Straight away then move ...

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http://www.mathwarehouse.com/trigonometry/lawofcosinesformulaexamples.php
Law of cosines formula to find the side or the angle in a triangle. Video tutorial, Model and practice problems plus a free worksheet with answer key!.

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http://www.mathwarehouse.com/trigonometry/sinecosinetangent.php
This page explains the sine, cosine, tangent ratio, gives on an overview of their range of values and provides many practice problems on identifying the sides that ...

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