Помогите алгебра 10 класс. 1)accos(-1)-arccoa1/2-3arccos(-√3/2) 2)arccos(sin 2П/3)...

Question

Помогите алгебра 10 класс.
1)accos(-1)-arccoa1/2-3arccos(-√3/2)
2)arccos(sin 2П/3)
3)ctg(accos(-1/2))

Answer 1

1)=п-п/3-3(п-п/6)=п-п/3-3*5п/6=2п/3-5п/2=4п/6-15п/6=-11п/6.

Comments

2)=arccos(sin(п-п/3)=arccos(sinп/3)= arccos√3/2=п/6.

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3)ctg(п-п/3)=-ctg п/3= - √3