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4.

cos 2x




1








































14. tg2x+1=0























































2




















































































































































15. tgx(2tg2x+1)=0


























































3




































































































5.

cos2x








































16. tg(

x

)







1








































2


























































































































































3






















































































































3


















































































































































































































































































6.

sin4x=-1























































17. sin 2 (x

30o )

1
















































































































7.

sin x
















2











































2




























































































































2








































18. sin(450




x)




1

























































































































































































































































































































8.

2sin x




2














































2




































































































9.

2sin 2x

1





































19. 2cos

2

3x







cos3y 0







































































































































































































10. sin x(2sin x










2)










0



















2






















































































































20. cos2x-3cos 2x=0
































































































































































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