Помогите пожалуйста) 

а)arccos(-1) - 2 arcctg 0=

б)arcsin (-корень из 3/2) + arctg корень из 3=

в)arccos (sin(-п/4))=

г)arcsin(-1) + 2 arctg 0=

д)arccos (-1/2) - 2 arcctg корень из 3=

е)arccos ( tg(-п/4))= 

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