Calculate: if x and y are odd integer number then x+y+3 are odd integer number

Proceed as in example 3 in section 6.1 to rewrite the given expression using a single power series whose general term involves xk. ∞ n(n − 1)cnxn − 2 n = 2 − 4 ∞ ncnxn n = 1 + ∞ cnxn n = 0

Which representation has a constant of variation of -2.5

Secant be and cf intersect at point d inside a what is the measure of cde