Question 1204911
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The solution in the post by @MathLover1 is not, actually, her solution.


It is copy/paste of the solution from other web-site, 

https://web2.0calc.com/questions/help_61560



She copied it from there, and pasted in this web-site 
under her name without a reference to the source.



        So, it would be INCORRECT to discuss if her solution is right,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;because it is not <U>her</U> solution.



If you ask, if that solution is correct in the original web-site, 
then my answer is: &nbsp;&nbsp;that solution starts from the statement
that angle FMP is 15°, where F is the perpendicular, drawn from point M to side BC.


This statement is correct, but its proof absents in the source.


It is, really, the KEY POINT to start the solution, but again, its proof ABSENTS in that source.


What follows in the source, is correct and leads to correct answer,
but formally the solution is incomplete.



If you ask me, how is it possible to copy from other web-site and from other author and then paste 
under other name without a reference, I will answer - I don't know; from my point of view,
it is EXTREMALLY irrespective to everybody around, but @MathLover1 makes it REGULARLY.


Several times I pointed it in my posts, and she, with no doubts, saw it.

But she regularly ignores it, to my great regret.