I'm kinda stuck on these three identity Questions: Could you explain how to solve these to me. Please and Thankyou.
6. Find the exact value of sin 2 ? given that cos ? = 12/13 and ? is in Quadrant I.
a. -120/169
b. 120/169
c. 60/169
d. -60/169
8. Find the value of the tan of a/2 given that cos a = -4/5 and a is in Quadrant II.
a. 3
b. 1/2
c. -2
d. -1/2
14. Evaluate sin 165 ° + sin 105 ° .
6. Find the exact value of sin 2 ? given that cos ? = 12/13 and ? is in Quadrant I.
a. -120/169
b. 120/169
c. 60/169
d. -60/169
8. Find the value of the tan of a/2 given that cos a = -4/5 and a is in Quadrant II.
a. 3
b. 1/2
c. -2
d. -1/2
14. Evaluate sin 165 ° + sin 105 ° .