If f(x) = `x^3 + x` , then find the value of f(1)f(2 )

Ilf f(x)={x^3, x 2 , then find the value of f(-1)+f(1)+f(3) . Also find the value (s) of x for which f(x)=2.

If f(x ) = x^3 - 1/x^3 , then find the value of f(x) + f( 1/x )

If f(x)=x^(3)+2x , then find the value of f(3) .

If f(x) = x^5 - 1/x^5 then find the value of f(x) + f(1/x)

If f(x)=x^3+2x then find the value of f(4)

If f(x+1/x)=x^2+1/x^2 then find the value of f(x)

If f(x) = x^2 , find the value of ( f(1.1) - f(1) ) / (( 1.1 -1 ))

If f(x)=x^(3)-(1)/(x^(3)) , then find the value of f(x)+f(-x) .

If f(x) = 1/( 1 - x ) , find the value of f[ f ( f(x) ) ]