If 3Tantita=cottita then tita=
You can find the complete Solution Of Your Problem in the following link;
There are Two ways to find the solution of Trigonometric Equation Analytical and Graphical , for fast solution You can go with Graphical But it is for those who are excellent at Mathematics:
https://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.775062.html

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