Question from Natalie, a student:

hi, i need help proving the following trig identity. i cant seem to figure out how to do it. thanks so much. (1+sin2x)/cos2x = cos2x/(1-sin2x)

Hi Natalie,

If you multiply both sides by 1 - sin2x and then multiply both sides by cos2x you get

(1 + sin2x)(1 - sin2x) = cos^{2}2x.

Does that help? Penny