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Math Help - Trig Limit

  1. #1
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    Trig Limit

    Exam tomorrow and the professor decided NOW we need to know trig limits. Despite never lecturing OR assigning hw on them. I've never taken calc, and am in accelerated right now...

    lim ....... 1 tanx
    x -> π/4 sinx - cosx

    I don't even know where to begin on this one.
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  2. #2
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    \frac{1-\tan{x}}{\sin{x} - \cos{x}} = \frac{\frac{\cos{x}-\sin{x}}{\cos{x}}}{\sin{x}-\cos{x}} = -\frac{1}{\cos{x}}

    now determine the limit.
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