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1 10. cos4x - sin4x = cos2x - sin2x 12. 14. 18. 20. 22. 25. tan2x = sec2x - cosx secx tan2A(1 + cot2A) = sec2A sin2x + sin2x tan2x = tan2x 11. cos2x = cscx sinx - sin2x (factor) 13. tan2x + sin2x +cos2x = sec2x 15. (1 — — I) = sin2x cotx = tanx secx cscx secx cosx (work both sides) cob( 17. cosx= secx 19. tanx cotx cscx cotx (work both ... ................
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