RE: Day 27 of my Math mini-contest for D.Buzz for February 2021 has been concluded! 😎
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The angle A is approximately 53.58° using the arccos function
I was talking about this statement on your solution. I haven't done all the work to check things out yet though.
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Well, the arc cos function is available on any scientific calculator, or on Google Search itself. 🤔
I thought you were referring to "solving the problem without using double angle identity". 🤔🤔