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Cosine rule (Finding an Angle) : ExamSolutions

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Uploaded by on Dec 7, 2010

In this maths tutorial I show you how to find an angle of a triangle using the cosine rule. To see this go to http://www.examsolutions.co.uk/maths-tutorials/Trigonometry/cosine-rule/tutor...

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Uploader Comments (ExamSolutions)

  • Got an exam coming up and didn't get any of this but then I watched your videos and it is now easy. Thanks a lot, great videos.

  • @Coolguy118118 Good luck for the exam

  • I dont know if you are a Examiner, but the first higher Edexcel gcse paper was the most hard one in 5 years (my teacher said that lol) and i hope i revise the right thing for the calc. paper.... THX MATE

  • @mattgomes28 Hi - No I am not an examiner but I have heard that it was quite tricky

  • thanks mate this has been a great help but i understand your cosine rule but i dont understand the one exams papers give could i just use the one you did instead?

  • @thesamster199 Of course (it is the same thing though)

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All Comments (39)

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  • where the hell did he get that 0.3.... coz when i put that in my calculator i get a different answer m so confused someone explain please

  • thumbs up if Hawker college brought you here

  • I want this guy to be my teacher instead :)

  • @ExamSolutions Thanks

  • fuck me it doesnt give me that decimal do you have to put something in brackets on the calculator for the first question i get a decimal of -771.3709

  • thankyouuu<3

  • u gota simplify it more then showed

    23.24/70.76 that gives u the decimal .3284

    just had to divide and get the decimal then do the final step it fondled me for a bit also

  • @examsolutions...what do you do when the total of your number given after is a negative number..how can you inverse that...for instance cosx = 4^2 + 9^2-7^2/ 2 x 4 x 9 = -785?...please i need some help!

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