reduce_sin.c fourthPi=0.785398 
x=0.100000, sinx=0.099833, res=0.099833, err=-2.35922e-16 
x=0.100000, sinx=-0.099833, res=-0.099833, err=-2.498e-16 
x=0.100000, sinx=-0.099833, res=-0.099833, err=1.249e-16 
x=0.100000, sinx=0.099833, res=0.099833, err=1.249e-16 
x=0.100000, sinx=0.995004, res=0.995004, err=0 
x=0.100000, sinx=0.995004, res=0.995004, err=0 
x=0.685398, sinx=0.774167, res=0.774167, err=0 
x=0.685398, sinx=0.632981, res=0.632981, err=0 
x=0.685398, sinx=-0.632981, res=-0.632981, err=-4.44089e-16 
x=0.685398, sinx=-0.632981, res=-0.632981, err=-1.90958e-14 
x=0.100000, cosx=0.995004, res=0.995004, err=0 
x=0.100000, cosx=0.995004, res=0.995004, err=0 
x=0.100000, cosx=-0.995004, res=-0.995004, err=-1.11022e-16 
x=0.100000, cosx=-0.995004, res=-0.995004, err=0 
x=0.100000, cosx=-0.099833, res=-0.099833, err=5.55112e-17 
x=0.100000, cosx=0.099833, res=0.099833, err=6.93889e-17 
x=0.685398, cosx=0.632981, res=0.632981, err=0 
x=0.685398, cosx=0.774167, res=0.774167, err=0 
x=0.685398, cosx=0.774167, res=0.774167, err=-3.33067e-16 
x=0.685398, cosx=0.774167, res=0.774167, err=-1.56541e-14