Question 966268
{{{(sin(x)+cos(x))(sin(x)-cos(x))=sin^2(x)-cos^2(x)}}}
{{{(sin(x)+cos(x))(sin(x)-cos(x))=-(cos^2(x)-sin^2(x))}}}
{{{(sin(x)+cos(x))(sin(x)-cos(x))=-cos(2x)}}}