A useful first step is to swap the variables: put y where x is, and put x where y (or f(x)) is. The rest follows from there.
John hosts an art workshop on the weekends. He has an average of 14 students in each session and charges a fee of $12 per sessio
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(1) On the unit circle, you have 
when 
, and more generally this is the case whenever you perform a full rotation about the origin. This means any time 
where 
is any integer.
(2) When
, you have 
.
(3) When
, you have 
.
(4) The law of sines says that
(5) The law of cosines says that
(2) When
(3) When
(4) The law of sines says that
(5) The law of cosines says that