Quantitative Aptitude - Arithmetic Ability Questions

In the following question, four number pairs are given. The number on left side of (–) is related to the number on the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

What is the value of cos2A/(1 + sinA)?

If x-1x = 10, then find the value of x4+1x2

If x - y = -8 and xy = 45, then (x2 + y2) is

If a + b = 10 and ab = 24, then the value of a3 + b3 is

The length of one side and the diagonal of a rectangle are 20 cm and 29 cm respectively. Find the length of its other side (in cm).

Given: 5x -3(2x-7) > 3x - 1 < 7 + 4x; then x can take which of the following values?

ΔABC is right angled at B. If m ∠A = 60°, then what is the value of 1/√3 Cosec C?