If `(x-5)^2-(x+4)^2`=-9 then the value of x is

If f(x) = (x - 1)(x - 2)(x - 3)(x - 4)(x - 5) , then the value of f' (5) is equal to

If f (x) =3x ^(9) -2x ^(4) +2x ^(3)-3x ^(2) +x+ cosx +5 and g (x) =f ^(-1) (x), then the value of g'(6) equals:

If |{:(2,3,2),(x,x,x),(4,9,1):}|+3=0 then the value of x is

If 5(tan^2x - cos^2x)=2cos 2x + 9 , then the value of cos4x is

If 5(tan^2x - cos^2x)=2cos 2x + 9 , then the value of cos4x is

If (5)/(x)=(9)/(x+2) , what is the value of (x)/(3) ?

If x+1 is a factor of ax^(3)+x^(2)-2x+4a-9 , then value of a .

If x=-5+2sqrt(-4) , find the value of x^4+9x^3+35 x^2-x+4.