Помогите пожалуйста!!!
1 Решите уравнение.
а) 2cosx =1
б) sinx/6 cosx/6= 1/4
в)2cos(-2x)= - √3
г)sin²x + 3sinx= 0
2 Решите неравенство
а)2sinx>1
б)2cosx<√3
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