Помогите пожалуйста, срочно)

 

1)2sin2x+3cosx=0 

2)5sin2x+8sin^2x=0

3)3cos2x-31cos^2x+27=0

4)3cos2x-22sinx-15=0
5)19sin2x+6cos^2x-12=0

6)3cosx+sinx-1=0 

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