Sapa tau cara buat ini? Tajuk trigonometric function.

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Hi, I have attached my answers as below, but I think there should be better ways of solving it!

Question 3:

3 Solve the equation \tan 2 x=-\frac{3}{\sqrt{3}} for all the angles between 0^{\circ} and 360^{\circ}.

Question 4:

4 A B C is a triangle such that \tan A=\frac{5}{12} and \cos B=\frac{4}{5} . Without using mathematical tables or a calculator, determine the value of \tan C.

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