a, b, and c are known and greater than zero, solve for theta and phi from the two equations i) and ii).
i)a*cos(theta) = b*cos(phi)
ii)a*sin(theta) + b*sin(phi) = c
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The problem is not difficult . . . The answers are ugly! are known and greater than zero. .Solve for and . . . . .
Substitute  into  and solve for . . . then solve for
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