The simplified value of the given expression `(9x^2-64)/[x-1-1/[1-x/[4+x]]]`

Simplify the given Expression : 5x^2+9x+6+4x+3x^2-8+5-6x .

For x=1 , The Value of the Expression : x^2+1=

Find the simplified value of- tan^-1(sqrt(1+x^2)+x)

The minimum value of the expression (9x^(2)sin^(2)x+4)/(x sin x) for x in(0,pi) is

Factorize the expression 9x^(4) + (1)/(x^(4)) + 2

Simplify and find the value of the simplified expression when x=-1 and y=2. 4(x^2+3y^2)-(9xy-[5(2x^3-3y^2)+xy)]

If x is real, prove that the value of the expression ((x-1)(x+3))/((x-2)(x+4)) cannot be between (4)/(9) and 1.