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Does that help?How to solve $cos^2x - sin^2x -1 = 03 answersJul 29, 2017Solving $sin 2x + cos 2x =-1 - Mathematics Stack .8 answersFeb 9, 2017why $ 1 - cos^2x = sin^2x $? - Mathematics Stack .5 answersDec 20, 2015Verify the identity $cos^2x-sin^2x = 2cos^2x-13 answersNov 17, 2014More results from math.stackexchange.comVideosYou will see more English now.4:13cos2x = 1 - sin^2x Trigonometric EquationYouTube · Anil Kumar4 minutes, 13 secondsSep 19, 20171:51Why Sin^2x + cos^2x = 1YouTube · Screened-Instructor1 minute, 51 secondsApr 21, 20223 key moments in this video1:55How to Solve Trigonometric Equations cos^2x-sin^2x=1 .YouTube · Dr. Masi1 minute, 55 secondsMay 5, 20201:14Simplify (cos^2x-sin^2x)/(1-tan^2x)YouTube · Turnupmath1 minute, 14 secondsDec 6, 2020Simplify (cos^2x-sin^2x)/(1-tan^2x)View all Fossil Watch Es3020, FORMULAS TO KNOW Some trig identities: sin2x + cos 2x .. PDFFORMULAS TO KNOW. 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