Question 442984
{{{2cot(x)/(1+cot^2(x))}}}
{{{2cot(x)/csc^2(x)}}}
{{{2cot(x)*sin^2(x)}}}
{{{2*expr(cos(x)/sin(x))*sin^2(x))}}}
{{{2*sin(x)*cos(x)}}}
{{{sin(2x)}}}