$\"\"$

\

The initial point is $\"\"$ and the magnitude of the vector $\"\"$ .

\

Consider the terminal point of the vector as $\"\"$ .

\

Here $\"\"$ and $\"\"$ .

\

If $\"\"$ is a vector with initial point $\"\"$ and terminal point $\"\"$ then the magnitude of the vector $\"\"$ is given by $\"\"$ .

\

Substitutue $\"\"$ and $\"\"$ in the above expression.

\

$\"\"$

\

Squaring on each side.

\

$\"\"$

\

Assume $\"\"$ .

\

$\"\"$

\

Consider $\"\"$ .

\

$\"\"$

\

One possible terminal point is $\"\"$ . $\"\"$

\

One possible terminal point is $\"\"$ .