calculus

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Which expression is equivalent to (sin x + 1)(sin x − 1)?

  • calculus (Steve help plz) -

    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^2x-1
    E. -cos^2x-1

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