How can you simplify sin4a+cos4a?
1 Answer
Jul 17, 2017
Explanation:
Note that
(sin2a+cos2a)2=sin4a+2sin2acos2a+cos4a
We see that
1=sin4a+2sin2acos2a+cos4a
Therefore,
sin4a+cos4a=1−2sin2acos2a
Hopefully this helps!