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ihatealgebrasomuch

  • 3 years ago

is the trigonometric ratio of cos225degrees 1? (im in the unit circle)

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  1. dpaInc
    • 3 years ago
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    no.... cos (225 degrees) is NOT 1

  2. dpaInc
    • 3 years ago
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    since you're on the unit circle.... look at the x-coordinate of 225 degrees...

  3. dpaInc
    • 3 years ago
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    cos (225 degrees) = the x-coordinate of the point on the unit circle.

  4. ihatealgebrasomuch
    • 3 years ago
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    im confused though, because if its a right triangle, and the reference angle is 45 degrees, then the opposite angle is also 45 degrees, making it a 45-45-90 triangle and the two legs' side lengths are the same so they would both be |dw:1359842106830:dw|

  5. dpaInc
    • 3 years ago
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    \(\large cos(225 ^\circ)=-\frac{\sqrt2}{2} \) \(\large tan (225 ^\circ)=\frac{\frac{\sqrt2}{2}}{-\frac{\sqrt2}{2}}=-1 \)

  6. ihatealgebrasomuch
    • 3 years ago
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    |dw:1359842455017:dw|

  7. ihatealgebrasomuch
    • 3 years ago
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    its just negative square root 2 /2?

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