I need help solving for a in this piecewise function by setting x=2 and setting them equal to each other, the trigonometry is confusing me a bit.. if I could get an explanation it would help me when studying. Thank you!

9. Now solve a numerically by setting at = 2 in each portion of the piecewise function and then setting them equaltoueachgthex. Show all the algebra/trigonometry below. La+33inl (x4)g},x22 123in1(x1)l x