Q1- Prove that cosh (z+2)= 1 2 =an + n=1 an (z+). Where n= 7/7 2 cosh 0 cosh(2 cos 0)de. an= 2 -2 Q2- Show that f dx 1+a-2acos x) 2 1-a Q4- State and Prove Laurent theorem. dx Q5-Show that (asin-x+bcosx) -2 de Q5-- Show that == qba ). a