Need some help on these problems. Help would be much appreciated:

1) find sin x/2, cos x/2, and tan x/2 from the given information:

cot x = 5, 180 degrees < x < 270 degrees

2) write the product as a sum

11 sin x/2 cos x/4

3) Find sin 2x, cos 2x and tan 2x from the given information

sec x = 2, x in quadrant IV

Thanks in Advance