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Math Help - sine and cosine

  1. #1
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    Post sine and cosine

    Okay so I am doing trig, and in it i am dealing with "sin" "cos" and "tan" BUT i can't figure out how to get rid of the "sin" or the "cos" in a question. The book doesn't even tell me how to either.

    The question :

    e = 54.0
    sin 50 degrees sin 44 degrees

    than it goes

    e= 54.0 sin 50 degrees
    sin 44 degress

    than it equals out to

    e=59.6 (there's a little dot over the = sign)

    and i am so confused... because no where does it tell you how to get rid of these signs.... PLEASE someone help...
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  2. #2
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    Quote Originally Posted by nikkinarcotic View Post
    Okay so I am doing trig, and in it i am dealing with "sin" "cos" and "tan" BUT i can't figure out how to get rid of the "sin" or the "cos" in a question. The book doesn't even tell me how to either.

    The question :

    e = 54.0
    sin 50 degrees sin 44 degrees

    than it goes

    e= 54.0 sin 50 degrees
    sin 44 degress

    than it equals out to

    e=59.6 (there's a little dot over the = sign)

    and i am so confused... because no where does it tell you how to get rid of these signs.... PLEASE someone help...


    okay so it didn't type it out right...
    when your first given the problem.. the 50 degrees is under the e and the 44 degrees is under the 54.0

    and than the 44 degrees is under the 54 sin 50 degrees
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  3. #3
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by nikkinarcotic View Post
    Okay so I am doing trig, and in it i am dealing with "sin" "cos" and "tan" BUT i can't figure out how to get rid of the "sin" or the "cos" in a question. The book doesn't even tell me how to either.

    The question :

    e = 54.0
    sin 50 degrees sin 44 degrees

    than it goes

    e= 54.0 sin 50 degrees
    sin 44 degress

    than it equals out to

    e=59.6 (there's a little dot over the = sign)

    and i am so confused... because no where does it tell you how to get rid of these signs.... PLEASE someone help...
    evaluate the sines in your calculator.

    \sin 50 \approx 0.766044443

    \sin 44 \approx 0.69465837
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  4. #4
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    Quote Originally Posted by Jhevon View Post
    evaluate the sines in your calculator.

    \sin 50 \approx 0.766044443

    \sin 44 \approx 0.69465837
    yeah but once you evaluate them, how does it get rid of them...
    like how do you go from

    e= 54.0 sin 50 degrees / sin 44 degrees (/ means over)
    and than get e=59.6.. like how does that make sense?
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  5. #5
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by nikkinarcotic View Post
    yeah but once you evaluate them, how does it get rid of them...
    like how do you go from

    e= 54.0 sin 50 degrees / sin 44 degrees (/ means over)
    and than get e=59.6.. like how does that make sense?
    as i said, plug it into your calculator

    e = \frac {54(\sin 50)}{\sin 44} = \frac {54(0.766044443)}{0.69465837} \approx 59.5
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  6. #6
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    Quote Originally Posted by Jhevon View Post
    as i said, plug it into your calculator

    e = \frac {54(\sin 50)}{\sin 44} = \frac {54(0.766044443)}{0.69465837} \approx 59.5
    THANK YOU!
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