Calculus (help Steve plz)
posted by Breanna .
1) if w = <-8, 15>, find ||w||?
2) which expression is equivalent to (sin x+1) (sin x -1)?
1. whassup? just a simple vector
|w| = √(8^2+15^2) = 17
since (sin+1)(sin-1) = sin^2 - 1
and cos^2 = 1-sin^2,
you have -cos^2 x