10. The Laurent series of is Which of the following statements is correct? (A) aβ=1/6 (B) aβ=1/12 (C) a+β=5/6 (D)a+β=1/3 (E) None of the above statements are correct.

7.Let z be a complex number. Which of the following statements is correct? (A) Log(z1/z2) = Log(z1)+ Log(z2), where Log(z) is the principal value of the complex logarithm. (B) cos(j) is not a real value.(C) , n=0,±1,±2,......(D) z2+2z-ez=,where exp(2)=ez. (E) None of the above statements are correct.