I will be doing question 16 part 2 June 08.
This question asks us to find the value of sine at (-4&pi/3). What worked best for me was to remember that its just looking for the sine value at that point on the circle, and if its negative instead of going counter clockwise you go clock wise (from 0&pi). This brought me to 120°. Once I found my point I looked up my sine ratio which is Y/1 so all I needed to do was find the Y value of this 30° 60° 90° triangle and since it was above the X axis I knew it was positive. the values of this triangle are hyp=1 X=1/2 and Y=&radic 3/2. This gave me the correct answer of &radic 3/2.
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