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Across 1. (1-cos2x)/2 3. Simplify sin(t-pi) 7. sin2t 9. sin(x-y) 10. SImplify (cos t-cos3t)/ (sint + sin3t) 11. 2cos(x+y/2) cos(x-y/2) 13. sinx/cosx 16. cos^2x -sin^2x 17. sin105 sin15 18. cos5ycos2y 22. 1/2[sin(x+y) + sin (x-y)] 24. 1-2sin^2x 25. tan^2x + 1

Down 2. sin7x-sin3x 4. sinxcosy+cosxsiny 5. SImplify (sin2y + sin4y)/cos2y -cos4y) 6. cos3tsint 7. cos3t + cost 8. cos(pi/2-y) 12. 1/2[cos(x+y) + cos(x-y)] 14. (tanx - tany)/ 1+ tanxtany) 15. csc2x 19. sin^2x + cos^2x 20. +-sqrt(1+cosx/2) 21. tan(pi/2 - x) 23. sin(pi/2-x)