Question: This is the problem and an answer from my teacher. I want to know how he did this in a detailed step by step process,

This is the problem and an answer from my teacher. I want to know how he did this in a detailed step by step process, and in-depth explanation. I will give thumbs up if explained well.

Written Solutions Write clear solutions for the following problems. A Communication grade, out of three, is given for conventional use of mathematical notation, and presentation of solutions. 6. 4 - 15. B - 7, and the angle between A and B is 60". What is the magnitude of A + B ?T _/3 Given, IAl = 15, 1831 = 7 and angle between And Po is 60". ie. 0= 60' Let , @ = AtB on , lel ? = 1Al ? + 181 2 + 2. ( A . B ) = 1A12 + 1B 12 + 2. 1Al 131 - 2050 = 15 + 7' + 2 x 15 x7 x eos 60 = 379 Hence the mangitute is 1 el = 1379 = 1 A + B = /379

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