Posted by anonymous on Tuesday, October 26, 2010 at 11:13pm.
Does 'using the unit circle' just mean that I use these:
In Quadrant I, theta=beta
In Quadrant II, theta=180beta
In Quadrant III, theta=180+beta
In Quadrant IV, theta=360beta
Because the whole lesson we did was about that sort of thing, which is all review from last year, but then at the end we did a quick example saying something about unit circles and every question in my homework is 'using the unit circle'.

Math  Henry, Wednesday, October 27, 2010 at 7:26pm
The unit circle is the graph of x^2 + y^2 = 1. The radius vector is viewed as the hyp. of a rt triangle and has a magnitude of 1. A vector is assumed to
rotate CCW. So if we start at 0 deg and
calculate the coordinates of the point
where the vector intersects the circle,
we get:
x = 1*cos0 = 1,
y = 1*sin0 = 0,
p(x , y) = (1 , 0).
So coordinates give us the sine and
cosine at any point on the circle.
For a complete graph and more detailed
INFO, GOOGLE,MATH:Unit circle.
Answer This Question
Related Questions
 PreCalculus  If sin(theta)=15/17 and cos(beta)=(5/13 (both theta and beta are...
 Pre Calc.  Use the sum or difference identity to find the exact value of sin255...
 Trigonometric Functions  Determine the Value of all six trigonometric functions...
 Algebra 2/ trig  sin theta= 7/25, 0< theta < pi/2 cos beta=8/17, 0, beta...
 pre calc  suppose beta is an angle in the second quadrant and tan beta=2. Fine...
 easy trig  If sin(theta)=[sqrt(70)]/7 and theta is in Quadrant two, find the ...
 simple trig  If sin(theta)=[sqrt(70)]/7 and theta is in Quadrant two, find the ...
 trig  If sin theta is equal to 5/13 and theta is an angle in quadrant II find ...
 Math  1. Let (7, 4) be a point on the terminal side of (theta). Find the exact...
 math  sin theta=3/5 and theta is in the third quadrant, find the following: ...
More Related Questions