Question 778499
{{{(1 + sin(x))/(1- sin(x)) - (1 - sin (x))/(1 + sin (x))}}}



{{{((1+sin(x))^2-(1-sin(x))^2)/(1-sin^2(x))}}}



{{{(1+2sin(x)+sin^2(x)-(1-2sin(x)+sin^2(x)))/(1-sin^2(x))}}}




{{{(1+2sin(x)+sin^2(x)-1+2sin(x)-sin^2(x))/(1-sin^2(x))}}}



{{{4sin(x)/(1-sin^2(x))}}}