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Math Help - Help! 3 Trig problems

  1. #1
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    Help! 3 Trig problems

    Hey guys! For the life of me I can't figure out how to arrive at the answers provided to exercises #4,5,6 (scan of questions provided below). I don't know which formula to use for which problem. If anyone can help and show the steps used that would be appreciated since this is killing me right now. Thanks a bunch! The answer to #4 is 1/2sin70deg ; the answer to question #5 is square root of 12 ; the answer to question #6 is 12/13

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  2. #2
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    Re: Help! 3 Trig problems

    #4: Use the Law of Sines.
    #5: Use the Law of Cosines.
    #6: Use the Pythagorean Identity.
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  3. #3
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    Re: Help! 3 Trig problems

    6#

    \tan A = \frac{\sin A}{\cos A} \Rightarrow \cos A = \frac{\sin A}{\tan A}
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