Question

Need help quick!!!

Answer 1

What don't you understand?

What have you tried?

Answer 2

i know the final answer just dont know the steps

Answer 3

and for now i only need help with 7A

Answer 4

For a 12 denominator you'll have to use the half-angle formula for sin.

Answer 5

7pi/12 is half of what angle?

Answer 6

7pi/6?

Answer 7

OK. Do you know the half-angle formula for sin?

Answer 8

no i dont

Answer 9

Well. I'll try to produce it:

Answer 10

ok

Answer 11

sin u/2 = \[\sqrt{\frac{ 1 - \cos u }{2 }}\]

Answer 12

ok so were do we go from here?

Answer 13

Well. you correctly told me that 7pi/12 was 1/2 of 7pi/6. So u must = 7pi/6. Right?