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)?
A. Cos^2x
B. cos^2x
C. Cos^2x+1
D. Cos^2x1
E. cos^2x1

1. whassup? just a simple vector
w = √(8^2+15^2) = 17
since (sin+1)(sin1) = sin^2  1
and cos^2 = 1sin^2,
you have cos^2 x