Question

find the missing value to the nearest tenth
cos( )= 12/15

Answer 1

You'll need to use the inverse function.

arccos(x)=y means that y is the angle measure that has a cosine value of x.

E.g., if cos(x)=1/4, then arccos(1/4)=x, it gives me the angle that has the input as its cosine value.

Answer 2

Oh okay, I get it now. Thanks so much!