Quantitative Aptitude - Arithmetic Ability Questions

If x = √2+1, then the value of x4-1/x4

If x + 1/x = √13, then 3x(x2-1) equal to

The simplest value of 38-212+20318-227+45 is

ΔABC is similar to ΔPQR. If ratio of perimeter of ΔABC : perimeter of ΔPQR is 5:9 and if PQ = 45 cm, then the length of AB (in cm) is?

A cone of radius 3.5 cm and height 27 cm is completely filled with water. This water is emptied into an empty cylindrical vessel of radius 2.1 cm. What will be the height of water in this vessel? (Take π = 22/7)

If 1/√(1+tan2A) = x, then value of x is

If ab-1b=cb-1c=ac-1a, then ac+ba+cb

What is the value of Cot 45°+ 1/3 Cosec 60°?