Quantitative Aptitude - Arithmetic Ability Questions

In the following question, four groups of three numbers are given. In each group the second and third number are related to the first number by a Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

A = (x8 – 1)/(x4 + 1) and B = (y4 – 1)/(y2 + 1). If x = 2 and y = 9, then what is the value ofA2 + 2AB + AB2?

­ What is the equation of the line if its slope is 3/4 and y­intercept is 5?

A root of equation ax2 + bx + c = 0 (where a, b and c are rational numbers) is 5 + 3√3. What is the value of (a2 + b2 + c2)/(a + b + c)?

2sin[(C+D)/2].cos[(C­-D)/2] is equal to

If Sinx = 4/5, then Sec2x - 1 = ?

At what point does the line 3x + 2y = -12 intercept the Y-axis?

Select the odd word/letters/number/number pair from the given alternatives.