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  • Apr 22, 2012, 10:46 AM
    Broncogirl8
    Trigonometric identity
    Sec(x) - tan(x) sin(x) = cos(x)
  • Apr 23, 2012, 08:14 AM
    ebaines
    Hint: convert the sec(x) and tan(x) functions to their sine and cosine equivalents. And remember that 1-sin^2x = cos^2x.

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