Question 256316
{{{sin(2x)=2sin(x)cos(x)}}}
{{{cos(2x)=1-2*(sin(x))^2}}}
{{{1-cos(2x)=1-1+2(sin(x))^2=2(sin(x))^2}}}
{{{(1-cos(2x))/sin(2x)=2(sin(x))^2/(2sin(x)cos(x))}}}
{{{(1-cos(2x))/sin(2x)=sin(x)/cos(x)}}}
{{{(1-cos(2x))/sin(2x)=tan(x)}}}