5.3. By setting k = , or otherwise, show that 1 (18) (2m +1)2 m=0 where n 2m + 1, i.e. expression (18) corresponds to a sum of n2 only over odd n.

Equations and inequalities describe the relationship between two mathematical expressions.

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.