Question

1+Cos2x/1-Cos2x- упростить выражение!!!

Answer 1

$\frac{1+cos2x}{1-cos2x} \\\\ \frac{ sin^2x+cos^2x+cos^2x-sin^2x}{ sin^2x+cos^2x-cos^2x+sin^2x} \\\\ \frac{2cos^2x}{ 2sin^2x} \\\\ ctg^2x$