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vera_ewing

  • one year ago

Math question

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  1. vera_ewing
    • one year ago
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  2. anonymous
    • one year ago
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    definitely not C

  3. anonymous
    • one year ago
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    if you do not have this memorized, do the same as before draw a triangle, find the missing side

  4. just_one_last_goodbye
    • one year ago
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    Would love to help but this type of problems are way above my knowledge xD good luck but you got pros that are helping c;' @satellite73 and @phi

  5. anonymous
    • one year ago
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    what you need is a good unit circle cheat sheet

  6. phi
    • one year ago
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    First step, identify the "line" that represents pi radians (or 180 degrees) ditto for 3pi/2 (270 degrees)

  7. vera_ewing
    • one year ago
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    Well I know tanθ = (sqrt)3 , so how do I find cosθ using the triangle?

  8. anonymous
    • one year ago
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    look in quadrant 3 to see where the second coordinate is \(-\frac{\sqrt{3}}{2}\)

  9. anonymous
    • one year ago
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    you will see that the first coordinate is \(-\frac{1}{2}\) , that is the cosine

  10. vera_ewing
    • one year ago
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    Wait wouldn't it be 1/2 not -1/2 ? Since it's in Quadrant 3?

  11. anonymous
    • one year ago
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    you will also see that the angle is \(\frac{4\pi}{3}\) although you were not asked for that

  12. anonymous
    • one year ago
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    no you are below the x axis in quadrant 3, so the first coordinate is negative, as is the second

  13. phi
    • one year ago
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    |dw:1436191312914:dw|

  14. vera_ewing
    • one year ago
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    Ohhh okay that makes so much more sense! Thank you :)

  15. anonymous
    • one year ago
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    just like ordinary graph paper left is negative in the x, down is negative in the y

  16. phi
    • one year ago
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    always put in a triangle in the correct quadrant. label the hypotenuse length 1 if they give you the sin, that is the y value if they give you the cos, that is the x value use pythagoras to find the unknown side. or , memorize the angles (painful, but doable)

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