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Math Help - trigo problem no. 22

  1. #1
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    trigo problem no. 22

    p198 q10 reex9
    thanks
    trigo problem no. 22-untitled.jpg
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  2. #2
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    Quote Originally Posted by afeasfaerw23231233 View Post
    p198 q10 reex9
    thanks
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    Your answers are clearly wrong since they don't satisfy the original equations.

    Your mistake is in forgetting that \theta - \phi = \pi is only one of several possible solutions to \cos (\theta - \phi) = -1. Other solutions include -\pi .....

    When you solve

    \theta - \phi = - \pi .... (1)

    \theta + \phi = \frac{5 \pi}{3} .... (2)

    simultaneously, you get the books answer (which is correct by the way).
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