If $$ {x=a^{2\over3}-a^{-2\over3}}$$ then the value of $$ {x^{3}+3x}$$.

If (a+b)=16 and a³+b³=1456, then what is the value of ab?

If $$ ({x+y\over z})=2$$ , then what is the value of $$ [{ {y\over {y-z}}}] +[{ {x\over {x-z}}}]$$.

If $$ {\sqrt{2x+9}+x=13}$$ then find the value of x?

If xy(x+y)=1, then $$ {1\over x^3 y^3}-{x^3-y^3}$$ is equal to-

If 5^√x + 12^√x = 13^√x, then x is equal to: 

simplify the following equation
$$ (1-{1\over3})(1-{1\over4})(1-{1\over5})......(1-{1\over n})$$

Two numbers x and y (x>y) such that their sum is equal to three times their difference. Then value of will be