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

A can do a work in 12 days while B can do it in 15 days. They undertake to complete it together for Rs. 450. what will be the share of A in this amount of money 

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

An angle in a semicircle is

A chord of length 16 cm is drawn in a circle of radius 10 cm. The distance of the chord from the centre of the circle is

If pq (p+q) = 1, Then the value of 1/p³q³ -p³-q³ is equal to