If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
(4-x^2)^2 = 0
(4-x^2)^2 = 0
(4-x^2)^2 = 0
-1*x^2 = -4 // : -1
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x in (-oo:-2) U (-2:2) U (2:+oo)
(-2*x)/((4-x^2)^2) = 0
-2*x = 0 // : -2
x = 0
x = 0
| 8-2=16106 | | 17-nx-2=-40 | | -0.04x=0.08 | | 4g+6=2g | | t-4(5)=0 | | 32x^5y/-8x^2 | | -3=2+5 | | 3(p+q)=q | | 8x=2x^2+3 | | log(7)(3x-5)+log(7)2=1+log(7)(2x-1) | | X=40+-2 | | 10x+2+7+3x= | | 3g-6+2g+1=7g+8k | | l+2n=l+13 | | X=2.50w+2.25 | | Cos(3x-π/4)=-1/2 | | 6+5(m+1)=27 | | -5x+x-8=-40 | | tnsh+rd=4t+4n+4s+2h | | 2x-9x+4x-6x= | | 4(m+2)=4 | | 2x-4(x-5)=-6+4x-16 | | f(x)=-9x^2+9x+1 | | n+(1+5n)=-2 | | 3.16666666667= | | 9*8/67 | | 5*0-7y=12 | | 4(2x+1)=5x+2 | | F(x)=2x+32 | | q=0.5p-6 | | 5x^2+32xy+35y^2=0 | | 4x-3y=-36 |