Answer:
Cos(y-z) = Cos(z-24)
Step-by-step explanation:
You have two equations in three unknowns, so no solution for the unknowns is possible.
The tangent equation tells you ...
... tan(z -24) = tan(y -z)
... z -24 = y -z . . . . . . take the arctangent
... cos(y -z) = cos(z -24) . . . . take the cosine
