WIL GIVE BRIANLY!!!
2 answers:
You might be interested in
(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