Verify the following identity by starting with the left hand side.

tan^2(x/2+pi/4)=1+sinx/1-sinx.....don't have a "pi" character, hopefully that was understandable. Not quite sure how to start this. Should I just use an addition formula?....or do I need to use a formula to lower the power on the tan^2....????...Loosin' my mind here....

Thanks for any help.

~CC