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Math Help - i fogrot how to solve these

  1. #1
    Senior Member furor celtica's Avatar
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    i fogrot how to solve these

    find, to 1 decimal place, all values of z in the interval -180 < z < 180 satisfying
    - cos(z)(1+sin(z))= 0
    - (1-tan(z))sin()z= 0

    the problem here is i don't even know how to sort these out algebraically so i can then find the trig values. for example on the first question:
    taking z(1+sin(z))= A
    cosA= 0 for -90 and 90
    so i have z(1+sin(z))=-90, 90
    and i blank out on how to solve!
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  2. #2
    MHF Contributor
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    Use the null factor law on each...
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  3. #3
    Senior Member furor celtica's Avatar
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    of course
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