Applications of Trigonometry | Math 11 Unit 12 | Law of COSINE (cos) | Lec_09

-----} Lecture series: "Mathematics 11, Chapter 12" by Mr. Gulraiz Afzal {-----

This lecture series will cover the complete unit along with its every minor concept for the First Year mathematics of PUNJAB TEXT BOOK BOARD. This chapter is also included in the books other Text Book Boards of Pakistan. Other than the Book, viewer may find some of its topics for his concept building. A viewer may also find this topic helpful for the ENTRY TEST preparation.

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We have learnt to solve the Right Angle Triangles in previous lectures. In order to solve the oblique triangles, one need formulas other than the trigonometric ratios. For that purpose we are driving these laws. Firstly we have derived Law of Cosine, this law can be stated in three different ways and can be proved by making suitable changes in the proof for one formula. Here we have proved only one of them. One only need to change the side of triangle along the positive x-axis in order to prove the rest of two formulas.

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#Trigonometry | #LawOfCosines | #FirstYearMath

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[harmainbinte]

Thank u soo much sir
This was really helpfull

[famii]

Sir, plzz law of cosines ky remaining dou bhi upload krr dyn.

[eipimath]

I really like this proof! I made a similar video on the law of cosines, hope to get your thoughts.