Помогите решить
12. Найти сумму корней на промежутке (ctgx+√3)sin2x=0 , на [-100˚;300˚]

13.(√3ctgx-1)cos(5pi/2-x)=0 , на [-150°;250°]

14. Cos(pi/2+2x)=√2sin(pi+x) ,на[-100˚;120˚] тоже найти сумму корней

На промежутке
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