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Mathematics arccos? urgent...really really urgent plz?

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sec(arctan(-10))...please can u tell me how to solve this?

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  1. secT = rt[1+ (tanT)^2]

    Use T = that stuff. Note that tan(arctanM) = M

    so secT = rt[ 1 + (-10)^2]= rt(101).


  2. ? sec(arctan(-10))

    = 10.0499

    arctan(-10) = -84.28941

    sec(-84.28941) = 1/cos(-84.28941)

    cos(-84.28941) = 0.099503

    1/0.099503 = 10.0499

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