Question 1005703
{{{ARC=(f(x[2])-f(x[1]))/(x[2]-x[1])}}}
{{{f(x[2])=sin((3/2)pi)=-1}}}
{{{f(x[1])=sin((5/4)pi)=-sqrt(2)/1}}}
{{{ARC=(-1-(-sqrt(2)/2))/((3/2)pi-(5/4)pi)}}}
{{{ARC=(-1+sqrt(2)/2)/(pi/4)}}}
{{{ARC=(-4+2sqrt(2))/pi}}}