Math
posted by Priscilla .
1. Write the expression as a function of an acute angle whose measure is less than 45.
a. sin 80
b. sin (100)
To find the postive acute angle, usually you would subtract 360 from the given measure. Would you have to subtract 45 from the given measure.
2. Points A (1,0) and B (.6,.8) are points on a unit circle O. If the measure of angle AOB = 0 {w/ a line in the middle}
Find
a. sin 0
b. cos 0
c. tan 0
But for the second question, I'm confused but I know x is always cos and y is always sin. I don't know how to use that to find sin 0 and etc.
Now thinking about it, should i use the distance formula for both of these two coordinates. I'm a little confused about this.

I really need help on this. Its just two problems I have. I'm extremely confused on only these two problems. I would appreciate it a lot if someone can help me. This would be the last time I ask help for math. Thanks a lot.