Question 829183
{{{((cos(a)-cos(b))/(sin(a)+sin(b)))+((sin(a)-sin(b))/(cos(a)+cos(b)))=(cos^2(a)-cos^2(b)+sin^2(a)-sin^2(b))/((sin(a)+sin(b))(cos(a)+cos(b)))=(cos^2(a)+sin^2(a)-cos^2(b)-sin^2(b))/((sin(a)+sin(b))(cos(a)+cos(b)))=(cos^2(a)+sin^2(a)-(cos^2(b)+sin^2(b)))/((sin(a)+sin(b))(cos(a)+cos(b)))}}}
{{{(1-1)/((sin(a)+sin(b))(cos(a)+cos(b)))=(0)/((sin(a)+sin(b))(cos(a)+cos(b)))=0}}}
verified: left side=right side