So i wen't to my Lecturer to ask him about what the -x means
sin (100 + x) = cos (-x)
And he just mumbles trying not to work as usual,
and then he finish's saying to just skip those questions with (-x) in it,
If you guys have Teachers that are willing to help you and mark your work, carry then on your hands,
because once you don't have that support anymore and you have to figure out how things work and come to gether on your own,
You'll wish for that support...
Any help wil be much appreaciated