$\"\"$

\

(a)

\

The equation is $\"\"$ and the value of $\"\"$ .

\

Consider $\"\"$ .

\

Substitute $\"\"$ in above equation.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Thus, the equation $\"\"$ is true for each value of $\"\"$ .

\

$\"\"$

\

(b)

\

The equation is $\"\"$ and the value of $\"\"$ .

\

Consider $\"\"$ .

\

Substitute $\"\"$ in above equation.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Thus, the equation $\"\"$ is true for each value of $\"\"$ .

\

$\"\"$

\

(a) The equation $\"\"$ is true for each value of $\"\"$ .

\

(b) The equation $\"\"$ is true for each value of $\"\"$ .