(Solved): Use an Addition or Subtraction Formula to find the exact value of the expression, as demonstrated ...

Use an Addition or Subtraction Formula to find the exact value of the expression, as demonstrated in Example 1. \[ \sin \left(-\frac{5 \pi}{12}\right) \] Find \( \sin \left(\frac{x}{2}\right), \cos \left(\frac{x}{2}\right) \), and \( \tan \left(\frac{x}{2}\right) \) from the given information. \[ \begin{aligned} \csc (x)=5,90^{\circ}