If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
cos(40) = 10/x // - 10/x
cos(40)-(10/x) = 0
cos(40)-10*x^-1 = 0
-10*x^-1 = -cos(40) // : -10
x^-1 = cos(40)/10
-1 < 0
1/(x^1) = cos(40)/10 // * x^1
1 = (cos(40)/10)*x^1 // : cos(40)/10
10*(cos(40))^-1 = x^1
x = 10*(cos(40))^-1
x = 10*(cos(40))^-1
| 4(x+7)+3x(x+7)=0 | | 4(x+15)=8x+12 | | 5x+20=7x+40 | | 16x-10(-2)=10 | | -8x-6(-2)=6 | | 12x+12=7x+12 | | 1/2x-7=3/4 | | (-3/5a^3x)^2 | | 5y=3y+46 | | 15-9=x+5 | | X-.12x=3000 | | 0.8(9+4y)= | | 2^3x-1=1/2 | | 100=3d+10 | | (y+sqrtx^2+y^2)dx-xdy=0 | | 2x+x-8=26 | | f=x+3-5y | | f=x+3*5y | | 120=2c+40 | | b+20=130 | | 60=2a | | 5/9(27)= | | -4(x+15)=8x+12 | | 5/9*27= | | (x)2+(x+7)2=(13)2 | | 7x+7x^2+7x+3x^2= | | z^3-3iz+1-i=0 | | 90=3y+5+43 | | y-43+y=50 | | 8(x+10)=6 | | -123-2.55= | | (-4)(-1)(-1)= |