Răspuns :
sin²x+49cos²x+14sinxcosx+49sin²x+49sin²x-14sinxcosx=50sin²x+50cos²x=
=50(sin²x+cos²x) =50*1=50
as sinxcosx as that!!
=50(sin²x+cos²x) =50*1=50
as sinxcosx as that!!