SOLUTION: Please help, I am so confused. The question reads: complete the identity {{{tan(theta/2)}}} and my answer options are a) {{{tan(theta)/(csc(theta)-1))}}} b) {{{tan(theta)/(csc

Look in your textbook or notes, or go to

http://mathworld.wolfram.com/Half-AngleFormulas.html

and you'll find that



We observe that all the choices have  on the top,
and since we know that 
we can make the top of the right side of the above identity into
 by dividing every term in the top and bottom by .




and since , we have



Edwin