Hello fellow users, I have 2 questions, thanks in advance!

Question 1:

Angle zlies in the second quadrant andhttp://www.mcgrawhill.ca/school/lear...6/image065.gif . Determine an exact value for sin2z.

K, so when I attempted this question, I got 120/169, I am not sure if it is -120/169, or 120/169.

Question 2:

and an angle and then apply a confunction identity to find the measure of

Given that http://www.mcgrawhill.ca/school/lear...udy_ch4_q6.gif , and ylies in the third quadrant, expresshttp://www.mcgrawhill.ca/school/lear...y_ch4_q6_1.gif as a difference between http://www.mcgrawhill.ca/school/lear...6/image033.gif y.

I legit have no idea what to do for this!