Kalpana

• When
  

  $x\ne 0$
  : Any non-zero number divided by itself is 1.
  • If
    

    $x=5$
    , then
    

    $5/5=1$
    .
  • If
    

    $x=-2$
    , then
    

    $\left(-2\right)/\left(-2\right)=1$
    .
  • This holds true for any positive or negative real number.
• When
  

  $x=0$
  : The expression becomes
  

  $0/0$
  .
  • Division by zero is an undefined operation in standard mathematics.
  • If we tried to define
    

    $0/0=c$
    , it would mean that
    

    $0\times c=0$
    . However, this is true for any value of
    

    $c$
    , so there is no unique answer. The result is considered an indeterminate form. 

Therefore, the condition

$x\ne 0$

is a critical implicit assumption whenever

$x/x=1$

is stated.

1. Begin With the Head. Before you draw hair, you have to have something to draw it on. ...
2. Outline the Shape. Using a light pencil, draw the outline of the hair's shape. ...
3. Shade. Using a darker drawing tool, such as a conté crayon or charcoal, begin laying the darkest values in the hair. ...
4. Add Fine Values

The basic elements of perspective drawing. In order to understand human perception, there are three important tools for perspective drawing: The horizon line, vanishing points, and vanishing lines.