Quantitative Aptitude - Arithmetic Ability Questions

Determine the value of 1r+1s when r3+s3=0 and r+s=6 ?

If cos 21° = x/y, then cosec 21° -­ cos 69° is equal to

The value of the expression 2(sin6θ+cos6θ) - 3(sin4θ+cos4θ) + 1 is

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

2 ­- (cosA + sinA)2 is equal to

In the following question, select the odd letter/letters from the given alternatives.

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

A 1.6 m tall observer is 45 meters away from a tower. The angle of elevation from his eye to the top of the tower is 30°, then the height of the tower in meters is