hey all this one question keeps bugging me if you could help thanks so much!
if it is an identity prove it.
(sinX+cosx)^2=1
if i expand it it becomes
sinx^2+cosx^2+2sinxcosx=1
if i chose to changd sinx^2 to 1-cos^2 it becomes
(1-cosx^2)+cosx^2+sinxcosx=1
so it simplifies to
1+sinxcosx=1
I cant seem to go anywhere from there....if im on the right track please let me know! or is it just not an identity?
THANKS!