zatanz(z,log(c^2))
0.0

zatanz(z,1/acos(acos(1/(c^2))))
0.0

zatanz(z,1/asec(1/(c^2)))
0.0

zatanz(z,1/asech(asech(1/((c+1/c)*(c+1/c)))))
0.0

zatanz(z,1/asinh((c+1/c)*(c+1/c)))
0.0

zatanz(z,1/atan(c))
0.0

zatanz(z,1/exp(exp(1/(c^2))))
0.0

zatanz(z,1/exp(exp(1/((c+1/c)*(c+1/c)))))
0.0

zatanz(z,1/sec(sec(1/(c^2))))
0.0

zatanz(z,1/tan(c^2))
0.0

zatanz(z,1/tan(tan((log(c))*(log(c)))))
0.0

zatanz(z,acoth(acoth(1/(c^2))))
0.0

zatanz(z,acoth(acoth(1/(log(c)))))
0.0

zatanz(z,acsch(acsch(c^2)))
0.0

zatanz(z,csch(csch((c+1/c)*(c+1/c))))
0.0

zatanz(z,log(1/(c^2)))
0.0

zatanz(z,log(log((c+1/c)*(c+1/c))))
0.0

zatanz(z,sinh(c+1/c))
0.0

zatanz(z,sinh(sinh(c)))
0.0

zatanz(z,sinh(sinh((log(c))*(log(c)))))
0.0

zatanz(z,tan(tan(c)))
0.0

zatanz(z,z1z2(z1z2((c+1/c)*(c+1/c))))
0.0

zatanz(z,z1z2(z1z2((log(c))*(log(c)))))
0.0

zatanz(z,z1z3(z1z3((c+1/c)*(c+1/c))))
0.0

zatanz(z,z1z3(z1z3(c^2)))
0.0