math check my work

find theta in radians to the nearest tenth if: sec(theta) = 1.4231

is this correct:

enter into calculator: cos^(-1)= 1/1.4231

get .7916232503, rounded to the nearest tenth = .8

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  1. I agree

    However, remember that there are multiple answers to these kind of questions,
    for the standard domain from 0 to 2pi, there would be another in the fourth quadrant, namely 2pi-.7916 = 5.4916

    to check, take cos(5.4916), then press your reciprocal key (1/x) on your calculator

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