SOLUTION: Hello there! My homework asks another question and asks me to find: a)tan 60 degrees b)sin 225 degrees c)cos 270 degrees I used the unit circle to help me, however t

Question 880328: Hello there!
My homework asks another question and asks me to find:
a)tan 60 degrees
b)sin 225 degrees
c)cos 270 degrees
I used the unit circle to help me, however the graphs on my homework all show with an arrow that I need to go counter clockwise to find the answer. Thank you for your help, I am getting better with the Unit Circle work, just still a little confused. VERY appreciated! :)
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Use how the angles are related to reference angles from the first quadrant. This is the general way of using the Unit Circle.

(b) sin(225), find how this relates to 90 or 180 or 360 degrees and use positions on unit circle to be sure of signs. ; your arrow is pointed into the third quadrant. degree difference. This points in the complete opposite direction from 45 degrees of the first quadrant. The sign of the sine is NEGATIVE.
-
.

(c) cos(270), this is between quadrant 3 and 4.
and , completely vertical pointing downward. y=-1 and x=0.
-
.
RELATED QUESTIONS
Find the value of tan(a-b) if cos a=4/5 sin b=-5/13 270 degrees < a < 360 degrees and 270 (answered by lwsshak3)

Calculate: A) Tan^2 225degrees-sin 60 degrees cos 30 degrees ( don't understand... (answered by Alan3354,ikleyn)

which equation is true ? A) sin 30 degrees=sin 60 degrees B) sin 45 degrees = cos 45... (answered by Alan3354)

Find the exact value of the following: a) tan 65pi/6 b) cos 150 (degrees) c) sin... (answered by Alan3354)

Find the value of tan (a+b) if sin a = -5/13, cos b = 4/5 270 degrees < a < 360... (answered by lwsshak3)

Use the given information to find cos(x/2), sin(x/2), and tan(x/2): Cos (x)=-4/5... (answered by lwsshak3)

Use the given information to find cos(x/2), sin(x/2), and tan(x/2): Cos (x)=-12/13... (answered by solver91311)

Use the trigonometric identities to expand and simplify if possible. For... (answered by MathLover1)

find each of the following 2(cos 225... (answered by stanbon)