Quantitative Aptitude - Arithmetic Ability Questions

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

If x = a cosθ+ b sinθ and y = b cosθ- a sinθ, then x2 + y2 is equal to

If [√(a2 + b2 + ab)] + [√(a2 + b2 – ab)] = 1, then what is the value of (1 – a2 )(1 – b2 )?

If secA/√(sec2A ­- 1) = x, then value of x is

What is the value of tan 7π/4?

In the following question, select the odd word from the given alternatives.

 In the triangle ABC, the internal bisector of angle A meets the side BC at D. If BD=7.5 cm and BC=9 cm. Then calculate the value of AB:AC.

If the shopkeeper sells an item at Rs 1000 which is marked as Rs 1250, then what is the discount he is offering?