Hello out there!
ich kenn nur
1 = cos²x + sin²x
Das gilt für _alle_ x.
Die Frage war: für _welche_ x gilt
0 = cos²x - sin²x?
See ya up the road,
Gunnar
--
“Remember, in the end, nobody wins unless everybody wins.” (Bruce Springsteen)
“Remember, in the end, nobody wins unless everybody wins.” (Bruce Springsteen)