If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
4/r = 0
4*r^-1 = 0 // : 4
r^-1 = 0
r należy do O
r belongs to the empty set
| x-2=x^2-16x+64 | | 5*4-(6/2)=x | | 5*(4-6/2)=x | | 101-17= | | x^3=9x^2+10x | | 210/21x | | x/17=26 | | 9x+9y-2xy+19=0 | | -27+64m^3=0 | | 125r^2-50r+5=0 | | 10x-0=14 | | 0.9m^2= | | 10m^2=2 | | 2a(9-a)=0 | | 6c+5d+3c+-2d= | | 1/x-1=1/16 | | 2x^2-x^4=1 | | 7-4/15 | | -14u+7+3u=7u+21 | | E=200+0.8(500-0)+10+0.1*500+100+100-100-0.15*500 | | 3x^3-18x+7=0 | | sin^2x+8sin^2x-20=0 | | 7(4w+3)=-8 | | (×/5)6= | | (×/5)6 | | -8(2t+9)=-136 | | 3(x^17y^15))^(1/4) | | E=0.8(Y-0) | | y=310+0.75Y | | 4(2l+3)=68 | | E=310+0.75Y | | 3(x-1)-4x=1-x |