$\"\"$

(a)

The parametric equations are $\"\"$ and $\"\"$ and $\"\"$ .

$\"\"$ then $\"\"$

The pythagorean identity: $\"\"$ .

Substitute $\"\"$ and $\"\"$ in the above equation.

$\"\"$

Equation of the curve $\"\"$ . $\"\"$

(b)

Graph:

Graph the parametric equations $\"\"$ and $\"\"$ :

$\"\"$

(a) Equation of the curve is $\"\"$ .

(b)

Graph of the parametric equations $\"\"$ and $\"\"$ :

$\"\"$