Выручите пожалуйста.
〖cos〗^3 x+〖cos〗^2 x=0
〖sin〗^2 x 〖cos〗^2 x+sinx cosx=0
2cosx cos4x+cosx-2cos4x-1=0
tg 3x/2 cos⁡(π/6+x)=cos⁡(π/6+x)
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