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Math Help - Cofunction Identity Question

  1. #1
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    Cofunction Identity Question

    Given that secb=csc0.64 and that b lies in the first quadrant, use a cofunction identity to measure angle b,to two decimal places. I dont know how to solve it. Please any hints?
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  2. #2
    MHF Contributor
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    Use the identity \sec(b) = \csc(\frac{\pi}{2} - b).
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  3. #3
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    ok so I did this
    since csc=0.64
    secb=0.64(pi/2-b)

    =1.0053-b
    im stuck! help!
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  4. #4
    MHF Contributor
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    \csc(0.64) = \csc(\frac{\pi}{2} - b)

    Hence, \frac{\pi}{2} - b = 0.64

    Solve for b!
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