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Math Help - trigo problem no. 23

  1. #1
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    trigo problem no. 23

    p198 q14 reex9
    don't know how to do b ii and iii . thanks
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  2. #2
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    Quote Originally Posted by afeasfaerw23231233 View Post
    p198 q14 reex9
    don't know how to do b ii and iii . thanks
    While I think about b ii ....

    b iii. If \cos A \cos B \cos C = 0 then one of \cos A, \cos B or \cos C has to equal zero. Therefore one of A, B or C has to equal 90 degrees.
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    after thinking this question for thirty min. i finally know how to do b ii and iii. thanks anyway
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