Solving Arccos Problems: 1) arccos x=pi/2 and 2) arccos x=3pi/2

[meowet]

(1)arccos x = pi/2 and (2)arccos x = 3 pi/2







I am new to this trigonometry equation math, and I would glad if someone could give me a site or so that can explain how to solce these equations. however I would be glad if someone could solve these problems for me.. because I have no one to ask

A detailed explanation would be appreciated

 

[HallsofIvy]

Since you haven't shown any attempt to solve them yourself, we don't know what you know or what definitions you are working with. Do you understand that "arccos" is simply the inverse of cosine? Do you understand that if f and f^-1 are inverse functions and y= f^-1(x), then x= f(y). In other words, the answer is staring you in the face!