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Math Help - Help!

  1. #1
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    Help!

    can anyone verify my answer for this? Please and thank you.

    Evaluate the other five trigonometric functions given that:

    cos (angle) = -2/2 given that: pi/2<(angle),3pi/2

    This is what i got:

    sin (angle) = + or - √2/2
    tan (angle) = + or - 1
    csc (angle) = + or - √2
    sec (angle) = -√2
    cot (angle) = + or - 1

    Find two coterminal angles for each angle; one positive and one negative.

    -425 (degrees)

    This is what i got:

    -425 + 360 = -65 (degrees)
    -425 - 360 = -785 (degrees)

    Thank you!!
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  2. #2
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    correction

    * angle < 3pi/2

    not angle, 3pi/2 sorry
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  3. #3
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    Quote Originally Posted by NeedHelp18 View Post
    can anyone verify my answer for this? Please and thank you.

    Evaluate the other five trigonometric functions given that:

    cos (angle) = -2/2 given that: pi/2<(angle),3pi/2

    This is what i got:

    sin (angle) = + or - √2/2
    tan (angle) = + or - 1
    csc (angle) = + or - √2
    sec (angle) = -√2
    cot (angle) = + or - 1
    Well, for this one, I got the same answers! My teacher gave me this nifty chart thing that really helps a lot! So, I think you're right! This is one of the few things I get in trig! hehe!

    Let me see your other problem....hmmmmm.....

    Blair (aka BAM!)
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  4. #4
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    Quote Originally Posted by NeedHelp18 View Post

    -425 (degrees)

    This is what i got:

    -425 + 360 = -65 (degrees)
    -425 - 360 = -785 (degrees)

    Thank you!!
    for this one.... i dunno. Sounds good to me....but I don't know.....sorry!
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  5. #5
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by NeedHelp18 View Post
    can anyone verify my answer for this? Please and thank you.

    Evaluate the other five trigonometric functions given that:

    cos (angle) = -2/2 given that: pi/2<(angle),3pi/2

    This is what i got:

    sin (angle) = + or - √2/2
    tan (angle) = + or - 1
    csc (angle) = + or - √2
    sec (angle) = -√2
    cot (angle) = + or - 1
    these are incorrect. (your signs are off. you must have either + or -, not both).

    Hint: what quadrant is the angle in?

    Find two coterminal angles for each angle; one positive and one negative.

    -425 (degrees)

    This is what i got:

    -425 + 360 = -65 (degrees)
    -425 - 360 = -785 (degrees)

    Thank you!!
    you have the right concept, however. the question asked for two angles, one POSITIVE, and one negative. you have two negative answers here. of course this answer is incorrect
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