# How do you simplify the expression #arccos(cos ((7pi)/6))#?

##### 1 Answer

#### Explanation:

Let y = cos x.

The period of cos x is

For

I make 'as is where is' inversion.

Referred to P.

Referred to Q,

Of course, the convention that

be broken here. for the sake of local 1-1 mapping in the neighbor

hood of Q. We cannot move to P saying that it is convention. It is

my opinion that any convention is not the rule, for all

contexts/situations/applications

It is befitting to adopt

(x, y), with 1-1 correspondence at the point of continuity...

.