Posted by meelizah on .
Which expression is equivalent to (sin x + 1)(sin x − 1)?

calculus (Steve help plz) 
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