driver: bad step at 0
acc=0.001 eps=0.001
npoints=73
a=0 y0(0)=0 y1(0)=1
b=7.06858347057703
y0 (b)=0.706903660582474  y1(b)=0.706865454018857
sin(b)=0.707106781186547 cos(b)=0.707106781186548
test passed