Question 521520
{{{(b^-2-c^-2)/(b^-1+c^-1)}}}


{{{((1)/(b^2)-(1)/(c^2))/((1)/(b)+(1)/(c))}}}


{{{(((c^2)-(b^2))/(b^2*c^2))/(((b+c))/((b*c)))}}}


{{{(((c-b)(c+b))/(b*b*c*c))/(((b+c))/((b*c)))}}}


{{{(((c-b)(cross((c+b))))/(b*(cross(b*c))*c))/(((cross((b+c))))/((cross((b*c)))))}}}


{{{(c-b)/(b*c)}}}


{{{((c)/(b*c)-(b)/(b*c))}}}


{{{((cross((c)))/((cross(c))*b)-((cross(b)))/(c*(cross(b))))}}}


{{{(1/b-1/c)}}}