anonymous
  • anonymous
is the trigonometric ratio of cos225degrees 1? (im in the unit circle)
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
no.... cos (225 degrees) is NOT 1
anonymous
  • anonymous
since you're on the unit circle.... look at the x-coordinate of 225 degrees...
anonymous
  • anonymous
cos (225 degrees) = the x-coordinate of the point on the unit circle.

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anonymous
  • anonymous
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|
anonymous
  • anonymous
\(\large cos(225 ^\circ)=-\frac{\sqrt2}{2} \) \(\large tan (225 ^\circ)=\frac{\frac{\sqrt2}{2}}{-\frac{\sqrt2}{2}}=-1 \)
anonymous
  • anonymous
|dw:1359842455017:dw|
anonymous
  • anonymous
its just negative square root 2 /2?

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