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-rw-r--r--src/projections/merc.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/projections/merc.cpp b/src/projections/merc.cpp
index 39685478..3a0ed7b4 100644
--- a/src/projections/merc.cpp
+++ b/src/projections/merc.cpp
@@ -15,7 +15,8 @@ static PJ_XY merc_e_forward (PJ_LP lp, PJ *P) { /* Ellipsoidal, forward
xy.x = P->k0 * lp.lam;
// Instead of calling tan and sin, call sin and cos which the compiler
// optimizes to a single call to sincos.
- double sphi = sin(lp.phi), cphi = cos(lp.phi);
+ double sphi = sin(lp.phi);
+ double cphi = cos(lp.phi);
xy.y = P->k0 * (asinh(sphi/cphi) - P->e * atanh(P->e * sphi));
return xy;
}