F[x_, y_] := Cos[x + y];
G[x_, y_] := F[F[x, x], F[y, y]];
H[x_, y_] := Cos[G[x, y]]^2 + Sin[G[y, x]]^2;
J[x_, y_] := H[x, y]*x*y;
K[x_, y_] := J[x, y]*Cos[x]/Sin[y];
Z[x_, y_] := K[x, x] + K[y, y];
V[x_, y_] := Z[x, x] + 1/Z[y, y];
B[x_, y_] := V[x, y]^2 + V[y, x]^2;
Q[x_, y_] := ArcCos[B[x, y] + B[y, x]];
lim = Pi/2;
Plot3D[Q[pX, pY], {pX, -lim
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