Quantitative Aptitude - Arithmetic Ability Questions

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

What is the value of [tan (90 – A) + cot (90 – A)]2/[2 sec2(90 – 2A)]?

If [a + (1/a)]2 – 2[a – (1/a)] = 12, then which of the following is a value of 'a'?

If sinA + sin2A =1 then what is the value of cos2A + cos4A

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

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

The average revenues of 7 consecutive years of a company is Rs 71 lakhs. If the average of first 4 years is Rs 66 lakhs and that of last 4 years is Rs 78 lakhs. What is the revenue for the fourth year.

A and B can do a piece of work in 18 days, B and C in 24 days, A and C in 36 days. Working together they can do the work in