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September 2, 2014

September 2, 2014

Posted by **Breanna** on Wednesday, November 28, 2012 at 10:33am.

2) which expression is equivalent to (sin x+1) (sin x -1)?

A. Cos^2x

B. -cos^2x

C. Cos^2x+1

D. Cos^2x-1

E. -cos^2x-1

- Calculus (help Steve plz) -
**Steve**, Wednesday, November 28, 2012 at 10:44am1. 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

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