Watch video Trigonometric Identity (1 - cos2x + sin2x)/(1 + cos2x + sin2x) = tanx online without registration, duration 03 minute 51 second in high hd quality. This video was added by user Anil Kumar 02 December 2014, don't forget to share it with your friends and acquaintances, it has been viewed on our site 19 thousand once and liked it 191 people.