Quantitative Aptitude - Arithmetic Ability Questions

A point P lying inside a triangle is equidistant from the vertices of the triangle. Then the triangle has P as its

cos(A+B) + cos(A-B) is equal to

If a2+1=9a, (a≠0) then the value of a2+1a2 is

Three solid spheres of radius 3 cm, 4 cm and 5 cm are melted and recasted into a solid sphere. What will be the percentage decrease in the surface area?

Smaller diagonal of a rhombus is equal to length of its sides. If length of each side is 6 cm, then what is the area (in sq.cm) of an equilateral triangle whose side is equal to the bigger diagonal of the rhombus?

The diagonals do not form at least two congruent triangles in a _____.

Find 2 consecutive natural numbers, sum of whose squares is 25.

Coefficient of x2 in (x + 7)(5 - 3x)(3x - 6) is