Find the values of following expressions: `i^(49)+i^(68)+i^(89)+i^(110)` (ii) `i^(30)+i^(80)+i^(120)` (iii) `i^+i^2+i^3+i^4` (iv) `i^5+i^(10)+i^(15)` (v) `(i^(592)+i^(590)+i^(586)+i^(584))/(i^(582)+i^(580)+i^(576)+i^(574))` (vi) `1+i^2+i^4+i^6+i^8+doti^(20)` (vii) `(1+i)^6+(1-i)^3`