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(43) = 9/x // - 9/x
cos(43)-(9/x) = 0
cos(43)-9*x^-1 = 0
-9*x^-1 = -cos(43) // : -9
x^-1 = cos(43)/9
-1 < 0
1/(x^1) = cos(43)/9 // * x^1
1 = (cos(43)/9)*x^1 // : cos(43)/9
9*(cos(43))^-1 = x^1
x = 9*(cos(43))^-1
x = 9*(cos(43))^-1
| 3m^2+10m+6=0 | | 45+5y+5+4z+9=180 | | 17.2-7.13= | | 3w+9x-12y+7w+6x+6y= | | (3x+5)(x-8)= | | 16.7-8.27= | | ((x^3)/3)-25x | | 3xR=-1 | | 8x+0.2=9x+1.2 | | 20w+25x+35y+40z+(-885)=0 | | 0.2[528-0.49]= | | 19/24-1/6x=1/8 | | x=c-b/a | | -10x-35-x=2x+4-8 | | x^2-200x+8000=0 | | 11y=10y-12 | | 11x-15=3x+7 | | 13x=6x+8 | | 5y+4=34-6 | | 0.83x-0.7=-4 | | 4x^2+8x-74=3 | | -8+3v=-(-3v+8) | | 2w-10w=64 | | x^2-200x-8000=0 | | 6c+92=108 | | -25+10=m-2 | | 18c+483=21c+462 | | Y=3-1/2(x-2) | | 16x=160 | | 36=(10-2x) | | 2.14-7.8= | | 1.2x-28=X |