Could someone please solve these questions. I am struggling with them. Very much appreciated. Donation will be provided

(i)If Cosec theta = 3.2 find theta (in degrees) 0<theta<360

(ii)If sin theta= .7 write down values for

a -sin (180 - theta)

b -sin (360 - theta)

(iii)Using the identitysin^2theta + cos^2theta=1and the identities for cos(A+B) find:

a - cos 75degrees if cos 45degrees = .707

b - cos 30degrees = 0.866

(iv)Prove that sinx/1-cosx + sinx/1+cosx= 2 cosecx