A: It says determine the coordinate point. I know that that means either (√2/2, √2/2), (1/2, √3/2), or (√3,2, 1/2) and I know that those coordinates corresponds to it being pi/3, pi/4 or pi/6 but how do I know if it's negative or positive and what quadrant it's in?
You have to understand what it means to take the sine value of an expression like If you draw the points in a cordinate system you will understand it.
For example, evaluate the
What are you doing? You are calculating the opposite/hypotenose. do you understand what the part represents?
Where can it be if it is positive/negative?
B: How do you evaluate a trig function?
Example: sin 7pi/2
Remember one complete circle is .
and since sine function repeats itself after each circle that means you can substract one circle . Leaving you with
C: The question is find cotO, if cscO=6, with O in quadrant II
Then it says for another similar question, csc^2 121^0 -cot^2 121^0
What do you mean ?
D:Find the remaining trig functions given sinO = 1/√3 and cosO=5/√3
(I do this like Pythagorean theorem right?) are you sure you got everyting right on this one? Or.. are these sin0 and cos0 two different angles/questions?
Any more specific questions just ask..good luck at your exam.